【題目】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世紀(jì)抗生素的發(fā)現(xiàn)給我們帶來了巨大的變化。

考查名詞辨析。invention發(fā)明,發(fā)明創(chuàng)造沒有的東西 ;instruction說明;method方法;discovery發(fā)現(xiàn),是去發(fā)現(xiàn)本來就存在的東西;從文字的表層意思推斷空格指抗生素的發(fā)現(xiàn);故選D。

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