閱讀理解.
     Thirty years ago, Lake Ponkapog in Hartwell, New Jersey, was full of life. Many birds and
animals lived beside the water, which was full of fish. Now there are few birds, animals, and fish.
The lake water is polluted (污染的). It is in a colour of dirty brown, and it is filled with strange
plants.
     How does this happen? First we must think about how water gets into Lake Ponkapog. When
it rains, water comes into the lake from all around. In the past there were forests all around Lake
Ponkapog so the rain water was clean.
     Now there are many homes around the lake. People often use chemicals (化學(xué)品) in their
gardens. They use other chemicals inside their houses for cleaning or killing insects (昆蟲). There
are also many businesses. Businesses use chemicals in their machines or shops. Other chemicals
fall onto the ground from cars or trucks. When it rains, the rain water picks up all the chemicals
from homes and businesses and then carries them into the lake. They pollute the water and kill
the animals.
     Boats on the lake are also a problem. Lake Ponkapog is a popular place for motorboats. But
oil and gas (油和汽)  from boats often get into the lake. So more bad chemicals go into the water
this way.
     People in Hartwell are worried. They love their lake and want to save it. Will it possible? A
dean lake must have dean rainwater going into it. Clean rainwater is possible only if people are
more careful about chemicals at home and at work. They must also be more careful about gas
and oil and other chemicals on the ground. And they mustn't use motorboats any more on the
lake. All these may change people's lives. Only then can Lake Ponkapog he a beautiful, clean
lake again.
1. In the past, the water in Lake Ponkapog was made clean by ______.
A. forests      
B. rain              
C. birds                
D. fish 
2. Chemicals from homes and businesses ______.
A. are always clean
B. can help the animals
C. are good for the lake
D. get into the rainwater

3. Cleaner rainwater will mean ______.

A. more boats on the lake
B. more dirty things in the lake
C. a cleaner lake
D. a dirtier lake
4. To save Lake Ponkapog, people need to ______.
A. be more careful about chemicals
B. use less water
C. grow fewer plants in the gardens
D. use more motorboats on the lake

5. The passage is about ______. 

A. boats on Lake Ponkapog
B. why the water is dirty in Lake Ponkapog
C. clean rainwater
D. dirty lakes
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