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
|