-- Is air the lightest thing in the world?
-- Not            . Scientists from Zhejiang University have just developed the world’s lightest material


  1. A.
    now
  2. B.
    yet
  3. C.
    then
  4. D.
    again
A
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。
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