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    -- 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   现在，既然；yet但是，然而；then那么，然后；again又，再；句意：在世界上空气是最轻的吗？——现在不是了。来自浙江大学的科学家们已经开发出了世界上最轻的材料了。结合语境可知选Ａ。

    考点：副词辨析

     

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