-- Is air the lightest thing in the world?
-- Not            . Scientists from Zhejiang University have just developed the world’s lightest material.
A．nowB．yetC．thenD．a(chǎn)gain
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(lái)自浙江大學(xué)的科學(xué)家們已經(jīng)開(kāi)發(fā)出了世界上最輕的材料了。結(jié)合語(yǔ)境可知選Ａ。
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