The professor held the crucible the Bunsen flame when heating the substance.

A. in B. above C. beside D. over

 

D

【解析】

試題分析：考查介詞。above只表示在上方或位置高出與below相對(duì)；over有覆蓋在上,越過(guò),正上方之意與under相對(duì)。根據(jù)句意，是在火焰之上，故用over

考點(diǎn)：考查介詞。

 

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