Test center 1: sound phenomenon
First, multiple choice questions
1.(20 10, Wuhu, Anhui, 12) Regarding the sound phenomenon, the following statement is correct.
A. an object can make sound without vibration.
B. Sound travels at different speeds in air and water.
C. The only way to reduce noise is to prevent objects from making noise.
D. "Don't talk loudly in public places" means asking people to speak quietly in public places.
2. (Guangzhou City, Guangdong Province, 20 10/0,3) According to the information given in Figure 2, judge that the following statement is correct.
A. Bats can make sounds with a frequency of 400 Hz.
B. People can hear the sound of bats at all frequencies.
C. The range of human auditory frequency is greater than that of human voice frequency.
D. 15Hz sound can be heard by human ears as long as its amplitude is large enough.
3. (Shandong Weifang 20 10, Question 1) The scene of the 60th National Day military parade is shown in the picture. The following statement is correct.
A. The military emblem on the flag bearer's hat shines, because the military emblem is the light source.
B the whole queue is uniform, and the audience is judged by the refraction of light.
C. the neat footsteps of the PLA are caused by air vibration.
D. the orderly footsteps of the people's liberation army are transmitted to the audience through the air.
4.(20 10, Yantai, Shandong, 1) Guitar is a musical instrument that young people like. Before playing, you need to adjust the tightness of the strings to adjust the sound of the strings.
A. amplitude B. loudness C. tone D. timbre
5. (Linyi, Shandong, 20 10, question 9) As shown in the figure, when you hang your mobile phone in a glass cover and dial with it, you can hear the loud ringing of the mobile phone and see the incoming call indicator of the mobile phone flashing. If the air in the glass cover is continuously pumped out by the air extractor, and then the mobile phone B dials the mobile phone A, the ringtone of the mobile phone A becomes smaller and smaller, and finally the ringtone can hardly be heard, but the incoming call indicator light of the mobile phone A can still be seen flashing. This experiment shows that
A. both sound and light need media. Both sound and light can travel in a vacuum.
C. sound can travel in a vacuum, but light can't. Light can travel through sound, but sound can't.
6.(20 10 Nanjing, Jiangsu, 1 Question) Which of the following statements is correct about sound?
A. sound waves have energy
B. sound can travel in a vacuum.
C. "No honking" is to control the noise during transmission.
D. As long as the object is vibrating, we can certainly hear the sound.
7.(20 10 Yangzhou, Jiangsu, 1) Different instruments play the same music at the concert, and we can also distinguish the sounds made by different instruments. This is mainly based on
A. Tone B. Tone C. Loudness D. Frequency
8.(20 10 Yancheng, Jiangsu, 8 questions) As shown in the figure, dial quickly with a hard card.
And slowly dial the teeth of the wooden comb, and the sound of the card changes. This experiment is used to explore.
A. Is the tone related to the vibration frequency of the sound source?
Can sound travel in a vacuum?
C. can sound travel in solids?
D. does it take time for sound to spread?
9.(20 10 Zhaoqing, Guangdong) Knock the same tuning fork twice with different dynamics, and compare the sounds made by the tuning fork twice.
A. different tones B. different loudness C. different timbre D. different tones, loudness and timbre.
10 (Guangdong Zhanjiang 20 10/0,4) Regarding the sound phenomenon, the following statement is correct.
A. "A man is known by his voice", mainly by the size of his voice.
B. "High" in "Dare not speak loudly for fear of disturbing people" refers to the high pitch of the voice.
C. During the senior high school entrance examination, it is forbidden to honk the horn on the roads around the school, in order to reduce the noise in the process of sound transmission.
D. Ultrasonic waves can break "small stones" in the human body, indicating that sound waves have energy.
1 1(20 10 2 questions in Guilin, Guangxi) Among the following statements about the generation and spread of sound, the correct one is ().
A. sound travels through the air.
B.as long as the object vibrates, you can hear the sound.
C. echo is formed by the sound reflected by obstacles.
D. the speed of sound propagation is not affected by the ambient temperature.
12(20 10, Heze, Shandong, 10) Among the following tone-matching phenomena, the wrong one is ().
A. "Know people by their voices"-different vocal bodies have different timbres.
B. "A long whistle, the mountain cries and the valley responds"-infrasound waves travel far.
C. "walls have ears"-solids can also transmit sound.
D Wash glasses with ultrasonic waves-sound waves can spread energy.
13.(20 10? Hebei Province, 12) The following statement about the family security door is incorrect.
A. the material of iron security door belongs to alloy.
B. You can identify the speaker by his voice through the security door.
C the handle of the security door is installed far away from the door shaft, which makes use of the force and the stress point.
D. Add a small amount of pencil powder to the anti-theft door lock, which is easy to open, and the pencil powder plays a lubricating role.
14.(20 10? The statement in Chengdu, Sichuan Province 1) about the four pictures shown in Figure L is correct.
A. The experiment shown in Figure A shows that vacuum cannot transmit sound.
The experiment shown in Figure B shows that the higher the frequency, the lower the tone.
C. The experiment shown in Figure C shows that human ears can reduce noise.
D. The bat in Figure D navigates by using the emitted electromagnetic waves.
15.(20 10 Nantong, Jiangsu 2 questions) Among the following statements about sound phenomena, the correct one is
A. Gas can't make sound. B. Sound is a wave.
C. Sound can travel in a vacuum. D. The greater the amplitude of the sound source, the higher the tone.
16.(20 10 Suzhou, Jiangsu 7 questions) Regarding sound, the following statement is correct.
A. Everything that makes a sound is vibrating B. As long as the object is vibrating, we can hear the sound.
C sound travels at the same speed in different media. D the speed of sound propagation in vacuum is 3×108m/s.
17.(20 10, Zhenjiang, Jiangsu, 1) The song "You and me, heart to heart ..." Fan Xiao said, "Liu Huan is singing." His judgment is based on his voice.
A. different tones B. different loudness C. different timbre D. different frequencies
18.(20 10 Jingmen, Hubei, 2 questions) Babies have been dealing with sounds since birth. The following statement about sound is wrong.
A. We can hear thunder in the distance, which means that air can spread sound.
B. People talking loudly on the shore will also disturb the fish in the water, which shows that water can transmit sound.
C stick your ear to one end of a long steel pipe and let others be gentle at the other end. You will hear several knocks, and the first sound you hear is through the air.
D astronauts can't talk directly in space, which means that vacuum can't transmit sound.
19.(20 10 Huanggang, Hubei, 16) "Humai" is a superb singing form of Mongolian people. Singers use skills to make the breath violently impact the vocal cords to form bass, and on this basis, adjust the mouth shape to form treble, realizing the rare phenomenon that one person sings treble and bass at the same time. The following statement is correct.
A. The treble and bass in Humai refer to the loudness of the sound. The sound in Humai is produced by vibration.
C. In Humai, the treble is ultrasonic and the bass is infrasound.
D. The propagation speed of treble and bass in Humai is different in air.
20.(20 10, Wuhan, Hubei Province, question 1) In the following picture, the construction workers are installing totally enclosed sound insulation screens for the light rail tracks adjacent to residential areas to minimize the noise generated by train operation. This noise control method is as follows
A. Prevent noise generation
B. Stop the spread of noise
C. Prevent noise from entering human ears
D. adopt the above three methods.
2 1.(20 10 Beijing, 14) ABC
22. (Laiwu, Shandong, 20 10, 1) There are many mysterious voices in nature. Sound is an important channel for people to exchange information, and it is a physical phenomenon that people often come into contact with in daily life. The following statement about sound phenomenon is wrong.
A. Listening with teeth, using bone conduction.
B. Ultrasonic energy can crush stones in human body, indicating that sound waves have energy.
C. information can be transmitted by sound waves and electromagnetic waves.
D "No honking" is allowed in some sections of the city, which is to reduce the noise in the process of sound transmission.
23.(20 10, Huai' an, Jiangsu, 1) As shown in the figure, the greater the force when drumming, the greater the drum sound. This phenomenon shows that the factor that affects the loudness of sound is the sound source.
A. Vibration amplitude B. Component materials
C. the speed of vibration D. its own structure
24.(20 10 Ningxia, 2 1 Question) As shown in the figure, four identical cups are filled with the same wine of different quality, and knocking on four cups with the same force will make different sounds. This "abnormal sound" mainly refers to the sound ()
A. Tone B. Amplitude C. Timbre D. Loudness
25. (Longyan, Fujian 20 10,2) At the Spring Festival Gala in 2010, Little Tiger met again 20 years later and sang their classic songs. When singing, the audience mainly distinguishes their voices according to their different vocals.
A. Tone B. Loudness C. Timbre D. Sound speed
26.(20 10, Shenyang, Liaoning, 1) The howler monkey is one of the loudest animals in the world. It warns other animals not to invade its territory with a thunderous roar. The word "thunder" here describes sound.
A. Tone B. Loudness C. Timbre D. Sound speed
27.(20 10 Xuzhou, Jiangsu, 1 Question) When exploring how the human ear hears sound, soap film can be used to simulate the eardrum of the ear. As shown in the picture, when the horn rings, the soap film will
A. Vibration B. Continue to move to the left C. Continue to move to the right D. Stay still
28.(20 10 Lianyungang, Jiangsu) The following statement about sound phenomenon is correct.
A. sound is produced by the vibration of objects.
B. The harder the gong is struck, the higher the tone of the sound.
The speed of sound propagation in vacuum is 3× 108 m/s/s.
D. The only way to reduce noise is to prevent objects from making noise.
29.(20 10, Wuxi, Jiangsu, 1) Regarding the sound phenomenon, the following statement is true.
A. sound is produced by the vibration of objects.
B. sound can travel in a vacuum.
People can distinguish the sounds made by different musical instruments because their loudness is different.
D. the speed of sound propagation is independent of the medium and temperature.
30.(20 10 Xiaogan, Hubei, 23 questions) The picture on the right is an experimental device for exploring sound phenomena. The following experimental phenomena are incorrect.
A. When the tuning fork vibrates, the table tennis bounces off.
B.the louder the voice, the farther you play table tennis.
C. The harder you knock the tuning fork, the higher the tone you hear.
D. the sound made by a tuning fork is transmitted to human ears through the air.
3 1.(20 10 Quanzhou, Fujian, 10) We can also tell who is talking on the phone, which is judged by the sound.
A. loudness B. timbre C. volume D. tone
32. (Liuzhou, Guangxi, 20 10, 10) In the classic Romance of the Three Kingdoms, the brave general Zhang Fei shouted loudly on the Dangyang Bridge in Changbanpo, scaring off Cao Cao's 100,000 troops. This allusion describes Zhang Fei's voice.
A. treble B. high frequency C. loud volume D. poor timbre
33. (Changsha, Hunan, 20 10, 16) Xiao He whistled. As the picture shows, he wrapped some cotton on chopsticks to make a piston. He soaked cotton in water, inserted it into a plastic pipe with openings at both ends, and blew the upper end of the pipe with his mouth, which could make a pleasant whistle. About whistle, the following statement is correct ().
A. the whistle is the sound produced by the vibration of the air column.
B.you can also hear the whistle on the moon.
C. When whistling, the purpose of pushing and pulling the piston up and down is to change the loudness of the whistle.
D. If the piston does not move, blow the whistle with more force, and the tone of the whistle will be higher.
34.(20 10 Zigong, Sichuan, Question 16) Sound is a common phenomenon, which is closely related to our lives. The following statement about sound phenomenon is correct ()
A. Some high-tech products can make sounds without vibration.
B. "A man is known by his voice", mainly by the size of his voice.
C. "No honking" is allowed in some sections of the city, which is to reduce the noise in the process of sound transmission.
D Ultrasonic waves can break "stones" in human body, indicating that sound waves have energy.
35.(20 10 Neijiang, Sichuan 5 questions) In order to reduce the interference of noise around the classroom on students' classes, among the following measures, () is effective, reasonable and feasible.
The teacher spoke louder.
B. The school puts on noise-proof earmuffs for every student free of charge.
C. plant trees or build sound insulation boards around the classroom.
D. install more noise monitoring equipment in the classroom.
36.(20 10 Bijie, Guizhou, 1) In May this year, the World Expo was successfully held in Shanghai, China. In order to fully show the theme of "Better City, Better Life" to the whole world, Shanghai's construction pays more and more attention to people-oriented. For example, cars in urban areas are forbidden to whistle, asphalt is laid on the main roads, and sound insulation boards are installed on both sides of roads in residential areas. The similarity of these measures is ()
A. Greening the living environment B. Alleviating the "heat island effect"
C. Reducing noise pollution
37.(20 10 Harbin, Heilongjiang, question 17) Tie the electric bell in the glass bell jar to the drawboard, as shown in the figure. After electrifying, you can see the bell vibrating and hear the sound of the bell. In the process of pumping air out with an air pump, you can still clearly see that the electric bell is vibrating, but the bell is getting smaller and smaller. For the explanation of the above phenomenon, the following statement is wrong.
A. Hearing the bell and seeing the bell vibrate means that the sound is caused by the vibration of the object.
B. hearing the ringtone getting smaller and smaller means that the sound can only spread through the medium.
C. seeing the vibration of the bell shows that the light beam can only spread through the medium.
D. Seeing the electric bell vibrate means that the light beam can penetrate the glass.
38.(20 10 Jixi, Heilongjiang province, 1 title) In the following pictures, the one that mainly describes that sound can transmit energy is ().
39.(20 10, Luzhou, Sichuan, Volume A, Question 1) After the earthquake in Yushu County, Qinghai Province, the Chinese rescue team arrived at the disaster area for earthquake relief at the first time. A good way for people trapped in the ruins of the building to ask for help from the outside world is to knock on the nearest iron pipe, mainly to get out ().
A, heat transfer b, sound transmission c, ventilation d, conduction
40.(20 10 Tianjin, 1 Title) We can distinguish the sounds made by different musical instruments, mainly according to their sounds ().
A. Different tones B. Different loudness
C. Different timbre D. Different intensity
4 1.(20 10 Yichang Hubei 1) 1. When watching TV, we adjust the volume of TV and change the sound of TV.
A. timbre B. loudness C. tone D. propagation speed
42.(20 10 Jingzhou, Hubei 30) Regarding the sound phenomenon, the following statement is correct.
A. As long as an object is vibrating, we can hear its sound.
B. Sound waves can be used to clean fine machinery such as clocks and watches, indicating that sound waves can transmit energy.
Noise barriers beside urban roads can prevent noise.
D. We can distinguish the voices of different students because they have different loudness.
43.(20 10 Putian, Fujian, 4 questions) Some teachers use portable public address equipment in class to make their voices louder, that is, to raise their voices ()
A. tone b, tone c, frequency d, loudness
44. (Guangdong Meizhou 20 10/0,6) The statement about sound and electromagnetic waves is correct.
A. Both sound waves and electromagnetic waves can transmit information, and both can spread in a vacuum.
B installing double-glazed windows in residential buildings can reduce the impact of outdoor noise on indoor environment.
C. "Stethoscope" can increase the vibration amplitude and loudness of human heart.
D "voiceprint lock" can only be opened when the owner speaks code, and the main basis for distinguishing sound is tone.
45. (Guangxi Hechi 20 10, 1 1) The following statement about sound phenomenon is correct. ................................. ()
A. Vacuum can also transmit sound.
As long as the object vibrates, we can hear sound.
C. The propagation speed of sound in various media is generally different.
D cars are forbidden to honk their horns in urban areas in order to reduce the noise during communication.
46.(20 10 Urumqi, Xinjiang 2 questions) What determines the speed of sound propagation?
A. vibration amplitude of sound generator B. vibration frequency of sound generator
C. Media for transmitting sound D. Material and structure of sound generator
Second, fill in the blanks,
1.(20 10 Anhui, 1 topic) Early spring, willow buds. You can break a wicker, loosen the skin and core, take out the wood core, and trim both ends of the tender skin with a knife to make a "willow flute". Blow hard and the flute will make a sound. Comparatively speaking, the sound produced by a thin and short flute has a higher pitch, which is caused by the vibration of _ _ _ _ _ _ _. Air column.
2.(20 10 Jining, Shandong Province, Volume II, Question 1)
The experimental phenomenon shown in figure 1 shows that.
Answer: The sounding body is vibrating (or the sounding paper basin is vibrating).
3.(20 10 Taizhou, Jiangsu Province, Question 15) The ocean depth can be detected by using sonar system. In the direction perpendicular to the sea level, sonar emits ultrasonic waves to the seabed. If the echo signal of the big seabed is received through 4s, then the depth of seawater there _ _ _ _ _ _ _ _ m (the speed of sound in seawater is 1500m/s). But ultrasonic sonar can't be used for space ranging (such as the distance from the earth to the moon). This is because _ _ _ _ _ _ _ _ _. Please name a space ranging instrument or method you know or imagine: _ _ _ _ _ _ _ _ _ _ _.
3000 vacuum silent electromagnetic wave transmitting and receiving device
4 (Linyi, Shandong Province, 20 10) As shown in the figure, when the paper touches the rotating gears with the same speed and different teeth, the pitch of the sound emitted by the paper is different, indicating that the pitch is related to the vibration of the sound source.
Answer: frequency (speed)
5. (Nanchang, Jiangxi, 20 10, 1 1) The porcelain produced in Jingdezhen, Jiangxi has the reputation of being as white as jade, as bright as a mirror, as thin as paper and as smooth as a tune. As shown in Figure 7, in the Jiangxi Pavilion of the Shanghai World Expo, performers are playing music with porcelain instruments. Porcelain chimes make music because of porcelain chimes. The audience can tell that a porcelain erhu and a porcelain flute are from the same tune, mainly because they make different sounds. Answer: Vibrating timbre.
6.(20 10, Zhaoqing, Guangdong, 14) Measures are taken to reduce noise mainly from three aspects: noise elimination, sound absorption and sound insulation. Common in life are: ① sticking foam material on the wall of recording studio; (2) add a muffler pipe to the automobile exhaust pipe; ③ Install glass walls on both sides of the road. The corresponding noise reduction measures in the above examples are: ①▲; ② ▲ ; ③ ▲ .
Answer: Sound absorption, noise elimination and sound insulation.
7(20 10, Heze, Shandong, 1) objects vibrate to produce sound. Sound, tone and timbre are the three characteristics of music, in which the tone is determined by vibration.
Answer: frequency
8.(20 10 Changzhou Jiangsu 1 9) March 20091day, 16, 13, 10 seconds, "Chang 'e-1" satellite was under the remote control of scientific and technical personnel of Beijing Aerospace Control Center. For us, this is a silent shock. There is a vacuum on the moon, and vacuum can't transmit sound.
9.(20 10 Henan Province, 3 questions) As shown in Figure 2, press a steel ruler tightly on the desktop, with one end sticking out of the desktop for an appropriate length, and stir the steel ruler to hear the sound of the steel ruler vibrating. Gradually increase the length of the steel rule protruding from the desktop, and the sound tone generated by the vibration of the steel rule will gradually change. When the steel ruler sticks out of the desktop for more than a certain length, although the steel ruler is vibrated with the same force, no sound can be heard. This is because. The vibration frequency of the low steel ruler is less than 20Hz.
10.(20 10, Laiwu, Shandong, 15) At the opening ceremony of the World Expo, the actors were singing loudly, accompanied by many musical instruments. The audience can tell which instrument is played according to the accompaniment they hear. Their voices sound three-dimensional, which is mainly due to the _ _ _ _ _ effect of human hearing. Answer: timbre, ears
1 1.(20 10 Xiangtan, Hunan, 2 1) As shown in the figure, put a small music chip that is sounding in the syringe, then push the piston to the bottom, seal the injection port with a rubber cap, and then pull the piston hard. At this time, the sound of the music chip in the syringe will change; Its voice reaches people's ears.
Answer: small, air.
12. (Liuzhou, Guangxi 20 10, 17) The sound is generated by the object _ _ _ _ _ _ _. Thunder and lightning happen at the same time, but we always see lightning first, and then hear thunder, because the speed of light in the air is _ _ _ _ _ _ _ _ _ _ (please fill in "less than", "greater than" or "equal to").
Answer: Vibration is greater than.
13.(20 10, Taian, Shandong, 13) The beautiful piano sound on the concert stage comes from the _ _ _ _ _ of the strings. If the piano sound is transmitted to the audience through _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Answer: vibration; Air; tone colour
14.(20 10 Guang 'an, Sichuan, 1) The sound is generated by the object _ _ _ _ _ _ _ _ _; 15oC, the speed of sound propagation in the air is _ _ _ _ _ _ _ m/s; Motorcycle muffler is in _ _ _ _ to reduce noise.
Vibration 340 sound source
15. (Shandong Dezhou 20 10, 2 questions) 20 10 On March 28th, Wangjialing coal mine was flooded, and the rescue work started rapidly. On the afternoon of April 2, the accident mine issued signs of existing life. It turned out that the trapped people issued a "Dangdang" distress signal by tapping the drill pipe. This is because the sound transmission effect is better than gas.
Answer: solid (or metal)
16.(20 10 Huadu District, Guangzhou, Question 13) In the Chinese examination room, the invigilator is emphasizing the requirements for the exam before the exam.
(1) The invigilator's voice is produced by the vocal cords, which are transmitted to the examinee's ears. Because the voices of the two teachers are different, candidates can distinguish their voices.
(2) During the examination, it is forbidden to whistle around the test center and start work at the nearby construction site. This measure belongs to reducing local noise.
Answer: 13. (1) vibration, air, timbre; (2) Sound source
17.(20 10 9 questions in Jilin province. Many TV stations often broadcast imitation shows, and voice imitation shows imitate sounds, and his voice reaches the audience's ears.
Answer: timbre, air
Third, short answer questions,
1.(20 10 Guangdong province, question 23) Look at the following passage.
"Eyes and Ears" of Submarine Sonar
The biggest feature of submarine is concealment. It needs to dive underwater for a long time in combat, which determines that it can't surface, can't use radar for observation, and can only rely on sonar for detection. Therefore, sonar is more important on submarines, and it is called "eyes and ears" of submarines.
Sonar is an electronic device that uses underwater sound waves to detect, locate and communicate underwater targets, and it is an important equipment widely used in hydroacoustics.
Sonar can emit sound waves into water, and the frequency of sound waves is mostly between 10 kHz and 30 kHz. Because of the high frequency of this sound wave, it can form a stronger directivity. When sound waves propagate in the water, if they encounter targets such as submarines, mines and fish schools, they will be reflected back, and the reflected sound waves will be received by sonar. According to the round-trip time of the sound signal, the distance of the target can be determined.
If the target hit by sonar sound wave is moving, the tone of the reflected sound wave (hereinafter referred to as "echo") will change. The changing law is as follows: if the tone of the echo becomes higher, it means that the target is moving closer to sonar; If the pitch of the echo becomes lower, it means that the target is far away from sonar.
Please answer the following questions:
(1) The frequency range that the human ear can hear the sound waves emitted by sonar is _ _ _ _ kHz to _ _ _ _ kHz.
(2)① If the acoustic signal sent by submarine A moored in seawater receives the signal reflected by submarine B within 10s, and the signal frequency remains unchanged, the distance between submarine B and submarine A is _ _ _ _ _ _. (Let the propagation speed of sound wave in seawater be1500m/s)
(2) Submarine A stopped in seawater continued to monitor submarine B, and suddenly the frequency of sound waves reflected by submarine B became lower. The speed of submarine B was measured to be 20m/s, and the direction was always on the connection line between submarines A and B. After one minute, the distance s2 between submarine B and submarine A was _ _.
(3) Can sonar technology be used to measure the distance between objects on the moon? why
Answer: (1) 0.02: 20; (2) 7500m: 8700m; (3) No, because the moon is vacuum, and vacuum cannot transmit sound.
(Question 33 of Liuzhou 20 10, Guangxi) (2) Please name one of the three links to control noise according to the requirements of the example, and give the corresponding example.
Example: sound absorption. Example: Wear anti-noise earplugs.
A: _ _ _ _ _ _ _ _ _ _. Instance _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Answer: Mufflers, motorcycles are equipped with muffler exhaust pipes.
Fifth, experimental inquiry questions,
1. (Huzhou, Zhejiang, 20 10, 3 1) Nie Li saw a lot of bees gathering on the hive in a beekeeping farm, their wings were sluggish and they were still buzzing. She doubts the conclusion that "the sound of bees is produced by constantly vibrating their wings" in "100,000 Why". Where exactly is the place where bees make sounds?
The following is the main exploration process of Nie Li:
(1) stick many bees' wings on the board, and the bees will still make sounds.
(2) Cut off the wings of many bees, and the bees will still make sounds.
③ Two small "black spots" were found beside the wing roots of bees. When bees make sounds, black spots stir up and down.
(4) Pierce the small black spots of many bees with a pin, and the bees will not make a sound.
Please answer:
(1) In his experiment, Mr. Nie Li used many bees for the following purposes.
(2) We can draw a conclusion from experiments ① and ②.
(3) "Punch out many small black spots of bees with pins" is based on this assumption.
The answer (1) avoids the chance of experiment.
(2) Bees don't sound because of the vibration of their wings.
(3) Bees make sounds by vibrating small black spots.