【題目】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世紀(jì)抗生素的發(fā)現(xiàn),給人類帶來(lái)了巨大的變化。

考查名詞。trust信任;instruction指令;method方法;discovery發(fā)現(xiàn)。根據(jù)后半句“has made a great difference to human beings. 給人類帶來(lái)了巨大的變化”和常識(shí)可知,應(yīng)該是抗生素的發(fā)現(xiàn),故選D。

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