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【题目】The ________ of antibiotics (抗生素) in the 20 century has made a great difference to human beings.

A.trustB.instructionC.methodD.discovery

【答案】D

【解析】

句意:20世纪抗生素的发现,给人类带来了巨大的变化。

考查名词。trust信任;instruction指令;method方法;discovery发现。根据后半句“has made a great difference to human beings. 给人类带来了巨大的变化”和常识可知,应该是抗生素的发现,故选D

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