题干

有关热带雨林生态脆弱性的说法,正确的是(    )

A:枯枝落叶使雨林中土壤一般很肥沃

B:植物生长的速度很慢

C:雨林植被一旦被毁,在高温多雨的气候条件下,地表植物很容易恢复

D:地上植被成为雨林最主要也是最关键的部位,而这又是最易遭受人类破坏的部分

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答案(点此获取答案解析)

D

同类题5

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    Will you put others' needs before your own? What 1 will you get if you do? Here is an experience of mine.

    It was a wet day and I had a 2time. I was busy and everyone I talked to was in a bad mood(心情). What's more, I went out without breakfast and I left my 3at home. So I couldn't get lunch and was terribly hungry.

    When I finished my work, I 4to ask my wife to meet me at the door with some money so that I could quickly go to buy 5. Then I quickly made my way home in hope of eating my 6meal of the day at 5:00 p.m.

    As I was halfway home, my wife told me by phone that a friend of ours was in 7and needed a lift(搭便车)home. My mind said, “I will get him 8I get the meal.” But my mouth said, “All right, I'll give him a 9”

    He jumped in the car with a smile on his face and repeated how 10he was that I would drive him home. He told me he usually walked home from his company but that day the 11stopped him from making that journey.

    Traffic was 12. A drive to his home normally took 10 minutes, but that day it took 30 minutes.

    Now you would guess the person that I was helping is a 13friend of mine. But, in fact, he is a friend of a friend's.

    I wonder if I will ever see this person again, but I feel glad I was there when he 14me.

    So you will feel yourself helpful and useful when you 15more about others.