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  3. What caused great migrations of animals and plants? [br] [originaltext]During t

What caused great migrations of animals and plants? [br] [originaltext]During t

游客2025-01-26  11
问题 What caused great migrations of animals and plants? [br]  
During the past 1. 65 million years, there have been four major episodes of global cooling, which resulted in great migrations of animals and plants. Yet, the earth remained.
Some parts of the earth are more likely to have quakes than others. This is usually true of mountainous areas, because there the thickness of rocks, which make up the earth’s crust, is not even.
选项 A、The thick rocks there are not even.
B、The rocks there are thicker.
C、The rocks there are solider.
D、The earth’s crusts there are unstable.
答案 A
解析 本题的关键是要准确判断原文因果逻辑关系，山区地壳岩层厚度不均匀(the thickness of rocks，…，is not even)，导致山区更容易发生地震，故A是正确选项。
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