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

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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 本题考查固定词组的习惯用法。as is well known词组的意思是:大家都知道,众所周知。
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