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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.nowB.yetC.thenD.again
A
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。
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