阅读理解。 |
1. Trees can get light from _____ in the daytime. |
A. CO2 B. O2 C. the sun |
2. Chlorophyll is in _____. |
A. sunlight B. soil C. leaves |
3. We can get more O2 by _____. |
A. planting more trees B. cutting trees down C. making the water in soil polluted |
4. CO2from 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 |
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 |