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 O
2 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:CO
2 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 |