-- Is air the lightest thing in the world?

-- Not            . Scientists from Zhejiang University have just developed the world’s lightest material.

A. now                         B. yet                                     C. then                                  D. again

 

【答案】

A

【解析】now   現(xiàn)在，既然；yet但是，然而；then那么，然后；again又，再；句意：在世界上空氣是最輕的嗎？——現(xiàn)在不是了。來自浙江大學的科學家們已經(jīng)開發(fā)出了世界上最輕的材料了。結(jié)合語境可知選Ａ。

考點：副詞辨析

 

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