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
________ is the most important festival in China.
#17287
A
Christmas
B
Spring Festival
C
Mid-autumn Day
D
National Day
Amy has just found a wallet lying on the ground. Can you find the correct sentence element(句子成分) of the underlined words in the sentence?
#17226
A
object complement
B
predicate
C
attributive
D
adverbial