5．
阅读下面短文，从每题所给的A、B、C、D四个选项中选出能正确回答所提问题或完成所给句子的最佳答案。
Hundreds
of years ago, life was harder than it is today. People didn't have modern
machines. There was no modern medicine, either.
Life today has brought new problems. One of
the biggest is pollution. Water pollution has made our rivers and lakes dirty.
It kills our fish and pollutes our drinking water. Noise pollution makes us
talk louder and become angry more easily. Air pollution is the most serious
kind of pollution to all living things in the world.
Cars,
planes and factories all pollute our air every day. Sometimes the polluted air
is so thick that it is like a quilt (被状物) over a
city. This kind of quilt is called smog.
Many countries are making rules to fight
pollution. Factories must now clean their water before it is thrown away, and
they mustn't let dirty smoke go into the air.
We
need to do many other things. We can put waste things in the dustbin and do not
throw them on the ground. We can go to work by bus with our friends in the same
car. If there are fewer people driving, there will be less pollution.
Rules
are not enough. Every person must help to fight pollution.
