The earth is our home. We must take care of it. Life today is easier than it was
years ago, but it has brought some new problems. One of the biggest problems is pollution（污染）. We can see it, smell it, drink it and even
it. Man has polluted the
. The more people, the more pollution.Many years ago, the problem was not so serious because there were not so
people. When the land was used up (用光), the river was not clean in a place,man went to
place. Now man is slowly polluting the whole world
pollution is still the most serious, it’s bad for
things in the world.Many countries don’t le t people burn
for air in houses and factories in the city. Pollution by SO2 is now the most dangerous kind of
pollution. It’s caused by heavy traffic. People say it’s
to ride bikes. When you are
, there is no pollution. But even in developed countries, most people don’t go to work by bike. It’s not
bikes are expen sive or people are tired if they ride to work. It’s because the number of cars on the roads becomes larger. So more people
their bikes and go to work by cars, then things are getting
. We should have special roads only for bikes and make it
difficult and expensive for drivers to take their cars into the city that they will go back to use their bikes.
| 小题1: | | A．hundred | B．hundredsof | C．hundredof | D．hundreds |
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| 小题2: | | A．listen | B．listento | C．hearof | D．hear |
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| 小题4: | | A．lot | B．little | C．many | D．much |
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| 小题5: | | A．others | B．theothers | C．theother | D．another |
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| 小题6: | | A．Air | B．Food | C．Water | D．Noise |
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| 小题7: | | A．life | B．live | C．living | D．lives |
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| 小题8: | | A．somethingbad | B．badsomething | | C．somethinggood | D．goodsomething |
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| 小题9: | | A．water | B．air | C．noise | D．white |
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| 小题10: | | A．least | B．best | C．most | D．worst |
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| 小题11: | | A．driving | B．biked | C．riding | D．ridden |
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| 小题12: | | A．why | B．because | C．what | D．how |
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| 小题13: | | A．puton | B．lookat | C．putaway | D．lookup |
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| 小题14: | | A．betterandbetter | B．moreandmore | | C．worseandworse | D．biggerandbigger |
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