It is earth’s heat______ scientists have developed a sensitive instrument to mea

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问题 It is earth’s heat______ scientists have developed a sensitive instrument to measure.

选项 A、who
B、whom
C、that
D、what

答案 C

解析本题考查强调句型，题意为，科学家们开发了一种灵敏的仪器来测量地球的热量。根据题意可知强调的是宾语，而且earth’s heat是指物，所以用that。

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