-- Is air the lightest thing in the world?-- Not . Scientists from Zhejiang University have just developed the world’s lightest material.
#35412
A
now
B
yet
C
then
D
again
推荐题目
--_______ does she chat with friends on the Internet? --Once a week.
#35765
A
How long
B
How much
C
How many times
D
How often
That's the most beautiful place ______ I have ever __________.
#35796
A
where; visited
B
that; visit
C
where; visit
D
that; visited
— _________ has Liu Xiang taken part in world’s competitions of 110-metre hurdles?— I’ve no idea. Let’s find it out on the Internet.
#35596
A
How often
B
How many times
C
How much time
D
How much