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What does the forest strike mankind as permanent? What has sometimes caused plants to die out of the past?

admin2012-11-30  31
问题 What does the forest strike mankind as permanent?
What has sometimes caused plants to die out of the past?
选项 A、Interference from foresters.
B、Variations in climate.
C、The absence of wooded land.
D、The introduction of new type of plants.
答案B
解析 本题考察对上下文的理解，需从字里行间找答案。第二段中，作者提到了气候是植物生长的基本条件，而气候一旦变得恶劣，植物可能会灭绝。
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