I asked for five black watermelon seeds and a hoe from my neighbor Aunt Mary's house. Under a big oak tree, grandpa taught me to loosen the soil and then sprinkle melon seeds. After all this, grandpa said, the next step is to wait. ?
I didn't understand, okay? Wait? What happened that afternoon? I don't know how many times I went to see my watermelon field, and I don't know how many times I watered it and turned it into mud. Who knows, until the evening, the watermelon seedlings did not even have a shadow. At the dinner table, I asked my grandfather, I've been waiting all afternoon. How long do I have to wait?
Grandpa smiled. If you wait so intently, maybe the seedlings will grow earlier. ?
The next morning, I woke up and ran to my Gua Tian. Hey! A big round watermelon is smiling at me! I'm so excited, I planted the biggest watermelon in the world!
A little bigger. I know this watermelon was moved to Gua Tian by Grandpa from home. Nevertheless, I don't think this is a game, nor is it a trick played by a loving grandfather to play tricks on his grandson, but at the right time, I plant the seeds of hope in the heart of a sensible child.
Now, I have my own children and have achieved something in my career. And I think my cheerful personality and successful life are the results of my grandfather sowing seeds under the oak tree. Grandpa could have told me that you can't grow watermelons in Las Vegas, and mid-August is not the season for planting melons, and it is not suitable for planting melons in the shade. But he didn't do it, but let me really experience it? Hope? With what? Success? Taste.
(1) Explain words in context.
Describe a strong interest and a high mood.
Wish: refers to the idea that you expect to realize in your heart.
(2) Write synonyms
Extensive concentration
(3) Fill in the blanks in the third paragraph of the article with appropriate punctuation marks.
Do you think grandpa did the right thing? Why?
That's right. Grandpa made me develop a life attitude of looking forward to the future and unremitting pursuit.
(5) Add appropriate topics to the article and write them on the horizontal line in front of the article.
P43
Mathematics and life
1. Make a fun game.
Rule number one: touch the ball. There are two red balls and 1 white balls in the bag. Xiao Qiang goes first when he touches the red ball, and Xiao Li goes first when he touches the white ball.
Rule 2: Flip a coin. Heads up Xiao Qiang goes first, tails up Xiao Li goes first.
Rule 3: Use? Scissors, bags and hammers? Way, whoever wins will go first.
(1) Which of the above rules of the game is fair and which is unfair, and why?
Rule 1: The probability of touching the red ball is 2/3, and the probability of touching the white ball is 1/3, which is unfair.
Rule 2: The probability of heads and tails is 1/2, which is fair.
Rule 3: The probability of scissors, luggage and hammer is 1/3, which is fair.
(2) Can unfair rules be modified to make them fair?
Rule 1: change the bag into red, white and black balls.
(3) Can we redesign a fair game rule?
Prepare three cards: A of diamonds, A of clubs, A of hearts. Touch A of hearts and go first.
Xiao Gang, Xiao Ming and Xiao Fang play cards together.
Xiao Gang made a rule of the game: choose 3, 4 and 5 hearts, arrange them face down in a row, and then turn them upside down to form a three-digit number. If it is a multiple of 2, Xiao Ming wins; If it is a multiple of 5, Xiao Fang wins; If it is a multiple of 3, Xiao Gang wins.
(1) Who is most likely to win? Do you know why?
(2) If everyone is equally likely to win, how to design the rules of the game?
Xiao Gang, because 3.4.5 is a multiple of 3 anyway.
It can be designed like this. If mantissa is 3, Xiaoming wins mantissa is 4, Xiao Fang wins mantissa 5, and Xiao Gang wins.
P45 tax payment certificate
1. Read and match.
Where did Tony travel around the world? What is the weather like there? Read one by one.
I am in England. It's raining and windy today. I am wearing a jacket and rain boots. I am in Canada. It is cold and snowy today. I'm wearing a coat and sweater.
I am in Egypt. It's sunny and hot today. I'm wearing a hat, a T-shirt and socks. I am in Australia. It's very cold today. I'm wearing a shirt and trousers.
P47
Looking for historical figures
Name: Confucius, Qiu Ming, Zhong Ni.
Born: 55 BC1September 28th, 479 BC, April 479 BC 1 1) was born in Lu Yi (now Nanxin Town, Qufu City, Shandong Province) in the late Spring and Autumn Period.
Main deeds: Confucius was a famous thinker, politician, educator and founder of Confucianism in the late Spring and Autumn Period. Revise poetry, calligraphy, ceremony and music, preface Zhouyi, and write Chunqiu. After the death of Confucius, his disciples and their re-disciples recorded the words and deeds, quotations and thoughts of Confucius and his disciples and compiled the famous Confucian classic The Analects.
Small scale test
1 Zheng Chenggong 2 Lin Zexu 3 Sun Yat-sen 4 Mao
P48
Explore space
? Small ball rolling slope? match
1. Fold the cardboard into a U-shaped groove with a width of 3cm and a length of 15cm. 2. Small glass ball, protractor, pen and some books. 1. The paper chute forms a slope. Measure the angle between the groove and the plane with a protractor and make records. 2. Let the ball roll down from the groove. 3. Measure the distance between the ball and the bottom of the groove and write it down.
Observation record sheet
angular distance
angular distance
90 55
20 32
32 32
54 69
74 98
45 13
52 18
23 54
39 84
45 1 1
Experimental conclusion: power = gravity+speed. Proof method: 1. When there is no initial kinetic energy, the ball will only roll down; 2. The steeper the slope, the faster the ball accelerates.
P49
Make a thermometer
The self-made simple thermometer is made according to the law that liquid expands when heated and contracts when cooled, with a small measuring range, and the measuring temperature is affected by external air pressure.
P5 1
Traffic transfer station
Clap your hands and sing children's songs about traffic.
The red light stops, the green light is on,
Look at every street sign clearly.
P52
Understand? Amazing? Water Cube, you must have a lot of feelings, please write it down!
We should learn to observe the things around us carefully and apply the laws and knowledge of nature to our lives to make our lives better.
Looking for it? Water cube? material