请看下面的情景提示:
海洋覆盖了地球表面约71%的面积,并且生产了地球上约70%的氧气。
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() 1. What are the two speakers talking about?

() 2. What do tiny ocean plants make for humans?

() 3. What kind of bird might you see in Zhalong Nature Reserve?

() 4. Where can we usually find zebras?

() 5. Where do monkeys live in the forest?
A. In the low place of trees. B. In the canopy(林冠层). C. In rivers.
() 6. Why are coral reefs colourful?
A. The sun changes their colour.
B. Tiny algae(海藻) give colour.
C. Fish paint them.
() 7. Why are polar bears in danger?
A. There is much ice. B. They can't find enough food. C. They find no space to live in.
() 8. What do birds find in wetlands?
A. Grass and flowers. B. Fruit and vegetables. C. Fish and insects.
() 9. What do mushrooms do in forests?
A. Make oxygen. B. Break down dead leaves. C. Grow fruit.
()10. Why do mountain hares turn white?
A. To look pretty. B. To stay safe. C. To stay warm.

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