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
It’s nice _______ you _______ me with my lessons. 
#16757
A
for, helping
B
for, to help
C
of, to help
D
of, helping
Which of the following is caused by the earth’s turning around the sun?
#17288
A
The rising and setting(落下) of the sun and moon.
B
The change of spring, summer, autumn and winter of the year.
C
The change of the day and night.
D
The time in the east is earlier than that in the west.
 Look at the table .Han Fang wants to buy two pieces of bread ,a bottle of orange juice and an ice cream .How much will she pay?
#17252
A
Five yuan and eighteen fen
B
Six yuan and twenty fen
C
Seven yuan and twenty fen
D
Eight yuan and twelve fen
E
d    1.20          Cake   1.50Water    0.80      Orange juice  1.80Coke     4.50      Ice cream    2.00
—What’s the woman in a white hat?—____________. 
#17209
A
She is my teacher
B
She is a cook
C
She is thirty
D
She is a girl