______ is well known, light, like heat, is a form of energy.A、ItB、WhatC、Just a

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问题 ______ is well known, light, like heat, is a form of energy.

选项 A、It
B、What
C、Just as
D、As

答案 D

解析本题测试固定结构“众所周知”的表达方法。“As is well known”和“It is well known that...”这两种结构都可以表达此含义。所以D为正确选项。句子的意思是：“众所周知，光和热一样也是一种能量。”

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______iswellknown,light,likeheat,isaformofenergy.A、ItB、WhatC、Justa