First, knowledge questions
(1) multiple choice questions
1. The symbol of mimicry is: a. Orchid mantis with similar appearance.
2. Green apples turn red from where A is exposed to the sun.
3. The correct statement about raindrops: B. Raindrops in summer are far from the ground before falling.
4. Fireworks are colorful because: a. The color of the flame reflects.
5.a. Static electricity is most likely to be generated in a dry environment.
Animals dream, too.
7. Dandruff falls off from the scalp.
8.c. Frogs are warm animals.
9.a. Large animals are more hardy.
10. Cats eat grass because C. Grass can help cats expel hair from their stomachs and make their stomachs more comfortable.
11.B. Cows have limited milk production time and can't produce milk all their lives.
12. Blood donation age A. 18~55 years old.
13. Xiao Qiang's blood types are all possible.
14. The minimum radiation dose is C, and ordinary X-ray examination is performed once.
15. The communication language of Hong Sheng Group: It has been circulated for thousands of years and will spread all over the world.
(2) True or False
1.(√) The butterfly has experienced the shape of egg-larva-pupa-adult all its life, so it belongs to a completely abnormal insect.
2.(X) When a person lies flat, blood circulates evenly in the human body, while when a person stands, there will be more blood in the lower part of the body due to the action of gravity.
3.(√) There is a very corrosive liquid in people's stomach, which is called gastric juice. The acidity of gastric juice is very high, which can digest bones and metals.
4. (10) During sleep, the brain runs 10 times faster than usual.
5.(√) Plants and people have the same blood type.
6.(√) Swallows are very clean birds, and young birds will put their butts out of the nest to defecate.
7.(X) When taking medicine, it is best to put the tablets on the root of the tongue, because the root of the tongue is the least sensitive to bitterness.
When spring comes, the water in the pond turns green because the pond is covered with green grass and trees.
9.(√) Hippocampus belongs to fish.
10.(√) The part behind the anus is the snake's tail.
1 1.(√) Because the propagation speed of tsunami wave is slower than that of seismic wave, it can be used for early warning of tsunami caused by earthquake.
12.(X) Bryophytes are different from roots, stems and leaves.
13.(√) Healthy people donate blood according to regulations, which is good for their health.
14. (10) bloodletting and engagement are scientifically based.
15.(√) The moisture absorption and perspiration fibers developed by Hong Sheng Group are widely used in sportswear fabrics.
Second, comprehensive application questions
1. Can the water in the cup boil?
(1) A. The water temperature in the glass is finally the same as that in the soup pot.
(2) The water in the cup C will not boil.
Step 2 compare speed with the moon
(1) second half moon phase c
C. the moon goes around the earth. When we move forward, the moon is also slowly rotating, so we feel that the moon is walking with us.
Fourth, divergent thinking.
Application of atmospheric pressure: ink absorption with pen, straw, water pump, syringe and cupping.
Verb (abbreviation of verb) research exercise
Possible reasons 1. The pipe joint was not taped tightly.
2. The cover at A is not sealed with vaseline.
3. The straw at A is not fixed with adhesive tape.
4. There is too little water at most.