--Isairthelightestthingintheworld?  --Not           .Sc...

問題詳情：

-- 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

【回答】

A

知識點：副詞

題型：選擇題