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The ________ of antibiotics (抗生素) in the...

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

A.trust B.instruction C.method D.discovery

 

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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