问题
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
B:yet
C:then
D:again
正确答案是：
同类题型
Uncle Wang has____________ bird and ___________ bird can talk to people.
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Is this ruler?No, is over there(在那边).
The old man never feels with his pet dog around though he lives in an old flat.
Mary often helped her mother ________ out the trash last year.