It is ____________(当物体加热时) that the average speed of molecules is increased.when

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问题 It is ____________(当物体加热时) that the average speed of molecules is increased.

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答案 when an object is heated

解析本句是一个强调句型，被强调的部分是一个时间状语从句；第二个考点是加热和物体之间的逻辑关系是被动关系，故要用被动语态。

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