阅读短文，选择正确答案。
Hundreds of years ago, life was much 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 easily. Air pollution is the most serious kind of pollution. It is bad for all living things in the world.
Many countries are making rules to fight pollution. We need to do many other things. We should put waste
things in the dustbins instead of on the ground. We can go to work by bus or with our friends in the same car.
If there are fewer people driving, less pollution will be made. Rules are not enough to solve the problems. Every
person must help to fight pollution.
1. Hundreds of years ago, life was much harder than it is today because _____.
[ ]
A. there were not any modern machines
B. there was no modern medicine
C. there were not many people
D. both A and B
2. What is the most serious problem in today's life?
[ ]
A. water pollution.
B. air pollution.
C. noise pollution.
D. pollution.
3. Why do people speak louder now than before?
[ ]
A. people are stronger.
B. people are afraid of nothing.
C. there is much noise.
D. people have problem in hearing.
4. What does the writer ask readers to do?
[ ]
A. each country should make its own rules to fight pollution.
B. every person must help to fight pollution.
C. all people should take buses.
D. we should control the population.
5. From the passage, we know that _____.
[ ]
A. the pollution is not serious
B. today people don't talk in loud voice
C. we have to drink dirty water
D. people are making rules to control pollution