问题

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

A: now
B:yet
C:then
D:again

正确答案是：

同类题型

_____ a pity that I forgot to bring your dictionary.

下列各句中，有语病的一句是（）

In the English class, I raised my hand and ____________the teacher a question.

Jane is a smart girl in theclass who is prettier than _______

Would you like to go to movies with me, Jack—Sorry, I can’t. Tomorrow is quite _____ for me.