六、看图.补全对话。

A: Look! There so many in the street.
B: Yes. Smoke cars the air dirty.
A: And cars use a lot of .
B: But there’s much energy Earth.
A: Yes. Then what should we ?
B: We drive less every day.
A: Yes. Your idea great.

六、are; cars; from; makes; energy; not; on; do; should; is

七、完形填空。
We have only one . We get land(土地), air and water from the Earth. We should take care of these . We should keep them .
Farmers grow . Crops(庄稼) from the dirty land are for us. We cannot build too many because there is not much land on Earth for farming. We should land.
We all need water. We live without(没有) water. We drink it and use it to do many things. But in some places, dirty water from pollutes the rivers.
We should take care of the too. We need clean air to live.
() 1. A. sun
B. Earth
C. star
() 2. A. things
B. thing
C. something
() 3. A. messy
B. dirty
C. clean
() 4. A. trees
B. crops
C. flowers
() 5. A. useful
B. good
C. bad
() 6. A. houses
B. boxes
C. trees
() 7. A. waste
B. make
C. save
() 8. A. cannot
B. can
C. could
() 9. A. factories
B. trees
C. flowers
() 10. A. air
B. water
C. land

七、1. B 2. A 3. C 4. B 5. C 6. A 7. C 8. A 9. A 10. A