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【题目】In 1808, an English chemist, John Dalton, proposed the theory ______ all matter is made of atoms.

A.which B.that C.what D.who

【答案】B

【解析】句意:在1808年,一个英国化学家约翰·道尔顿提出了这种理论——所有的物质都是由原子组成的。分析句子,______ all matter is made of atoms.是解释说明theory的内容,故是同位语从句,根据句意空格处所需的连接词没有意义,只起连接作用,故选B项。

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