A, people don't forget to turn off the lights when they leave; Don't forget to turn off the tap when washing by hand. B, use electronic greeting cards instead of paper greeting cards.
C. Use disposable chopsticks, plastic bags and other items as little as possible. D. Waste batteries are useless to throw away.
2. Some communities in Jiaxing have started to use the natural gas of the West-East Gas Transmission Project. The main component of natural gas is CH4. The following four students are discussing the meaning of chemical formula CH4, and the mistake is ().
3. When I was a child, I didn't know the moon, so I called it a white jade plate. The moon phase described in it is ().
A, new moon B, first quarter moon C, full moon D, last quarter moon
4. China began to implement the renewable energy law on June 65438+1 October1day, 2006. This law not only shows people the great significance of renewable energy for future social life, but also points out a clearer direction for the future development of renewable energy. The following do not belong to "renewable energy" ()
A, wind energy b, ocean energy c, solar energy d, petroleum
On a hill, there are many creatures, such as grass, trees, birds, insects, snakes, bacteria and so on, which form with their living environment ().
A, biological community B, ecological factor C, ecosystem D, biological population
6. Students go home by bike after school, even if they don't pedal when going downhill, the speed will be faster and faster. This is because of the () between people and bicycles.
A, mechanical energy is getting bigger and bigger; B, inertia is getting bigger and bigger.
C, gravity is getting bigger and bigger. D, gravitational potential energy is converted into kinetic energy.
7. The following statement about ABO blood group system is wrong ()
A. The blood type of A.ABO blood group system is determined by the lectin on red blood cells.
B, a person's blood type is determined by heredity and will remain unchanged for life.
C. There are two kinds of agglutination on red blood cells: lectin A and lectin B.
There is no anti-A in the serum of blood type D and O; Anti-b agglutinin
8. In the following experimental operations, the incorrect one is ().
Is this the topic?