It’s necessary for human beings to breath _______ and plants can produce it.
#17259
A
CO2
B
H2
C
O2
D
N2
推荐题目
Many people have got the habit of buying flowers for their mothers on _______.
#17273
A
Mothers’ Day
B
the Mothers’ s Day
C
the Mother’s Day
D
Mother’s Day
—Look! The line of people is ______.—Bad luck. I don’t think we can get any tickets.
#17067
A
hopeless
B
helpless
C
endless
D
careless
If you go to Singapore, you have to learn to speak _______ and __________.
#17279
A
Chinese, Japanese
B
English, French
C
Chinese, English
D
English, Japanese