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

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

admin2009-04-23  69
问题 It is ____________(当物体加热时) that the average speed of molecules is increased.
选项
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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大学英语四级

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