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【小題1】Trees can get light from in the daytime.

A．C0₂

B．O₂

C．the sun

D．the moon

【小題2】Chlorophyll is in .

A．sunlight

B．soil

C．air

D．leaves

【小題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

【小題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

【小題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

【小題1】C
【小題2】D
【小題3】A
【小題4】B
【小題5】A

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