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
—My grandmother died last month, I’m very sad about it.—____.
#17245
A
You are welcome
B
That’s all right
C
I’ m sorry to hear that
D
I hope you'll feel better soon
In English-speaking countries, ____is unlucky number while ____is unlucky number in China.
#17087
A
14;4
B
13;4
C
11;4
D
13;0
—We will finish the task very quickly if your team can help us.—That’s right. .
#17235
A
Early bird catches the worm.
B
Two heads are better than one.
C
Many hands make light work.
D
Great minds think alike.