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
The underlined letter “ a” in the word “______” has a different pronunciation from the others.
#17057
A
math
B
calendar
C
fantastic
D
behave
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
英语共有_____个字母,有_____个元音字母,有_____个辅音字母,半元音字母有_____个。
#17197
A
26, 5, 19, 2
B
26, 5, 20, 1
C
26, 20, 5, 1
D
26, 7, 19, 0