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 O₂by _______.
A. planting more trees
B. cutting trees down
C. making the water in soil (土壤) polluted
D. making more CO₂
4. CO₂from 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. O₂into air
5. The picture tells us _______.
A. how trees let O₂go 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 O₂and let out CO₂

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