
小题1:Trees can get light from in the daytime.
A.C02
B.O2
C.the sun
D.the moon小题2:Chlorophyll is in .
A.sunlight
B.soil
C.air
D.leaves小题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小题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小题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