The main idea of this passage is . A rock cracks when .

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问题 The main idea of this passage is ______.
A rock cracks when ______.

选项 A、rain falls
B、it gets very hot
C、it gets very cold
D、either B or C

答案D

解析可以直接找到本题的依据句"When a rock gets very hot or very cold，it cracks"，很容易确定答案。

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GCT工程硕士（英语）

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