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【题目】The ____of antibiotics(抗生素) in the 20th century has made a great difference to us.

A.inventionB.instructionC.methodD.discovery

【答案】D

【解析】

句意:20世纪抗生素的发现给我们带来了巨大的变化。

考查名词辨析。invention发明,发明创造没有的东西 ;instruction说明;method方法;discovery发现,是去发现本来就存在的东西;从文字的表层意思推断空格指抗生素的发现;故选D

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