2. 外语
  3. Just consider that we use hardly one hundred-thousandth of the heat______in coal and that could be extracted from it.

Just consider that we use hardly one hundred-thousandth of the heat______in coal and that could be extracted from it.

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问题 Just consider that we use hardly one hundred-thousandth of the heat______in coal and that could be extracted from it.
选项 A、it is
B、there is
C、as is
D、what is
答案B
解析 there is in coal是定语从句，省略了关系代词that，复原后应为：…we use hardlyone hundred—thousandth of the lleat that there is in coal。当定语从句是there be句型时，关系代词that经常省去不用。题句如果选it is，那么与主句之间没有连接词；如果选what is，what不需要先行词，而句中已给heat；as虽然是关系代词，但所引导的句子在语义上有"像……一样"的含义，不符合该句的意思，所以这几项均错。
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