阅读理解。
1. Trees can get light from ______ in the daytime.
A. C02
B. O2
C. the sun
D. the moon
2. Chlorophyll is in _______.
A. sunlight
B. soil
C. air
D. leaves
3. We can get more O2 by _______.
A. planting more trees
B. cutting trees down
C. making the water in soil (土壤) polluted
D. making more CO2
4. CO2 from air and _______ can produce food for trees with the help of chlorophyll and sunlight.
A. water in the sea
B. water from soil
C. water in the river
D. O2 into air
5. The picture tells us _______.
A. how trees let O2 go into air in the sunlight
B. how trees let CO2 go into air in the sunlight
C. the sunlight isn't important to trees at all
D. trees can take in O2 and let out CO2
