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

______ 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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