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

A．C02B．O2C．the sunD．the moon
【小題2】Chlorophyll is in         .
A．sunlightB．soilC．a(chǎn)irD．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 seaB．water from soil
C．water in the riverD．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

解析

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