Hundreds of years ago, life was much harder than it is today. People didn’t have modern machines. 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. It’s bad to all living things in the world.
Polluted air from cars, planes and factories is so thick that it is like a quilt(被子) over a city. This kind of quilt is called smog(烟雾). Many countries are making rules to fight pollution. Factories must now clean their water before it is thrown away. And they mustn’t blow dirty smoke into the air. We need to do many other things. We can put waste things in the dustbin and not throw it on the ground. We can go to work by bus or 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.
Hundreds of years ago, life was much harder than it is today because ___  __.

A．there were fewer modern machines at that time than today

B．people didn’t like to use modern medicines

C．there were no modern machines at all

D．there was no pollution at all

What is the biggest problem in today’s life?

A．Dirty water.	B．Pollution.
C．Noise.	D．Too crowded

The most serious kind of pollution is ___  ___.

A．noise pollution	B．air pollution
C．water pollution	D．waste paper

Factories must clean their water ___  ___.

A．before they use it	B．when they use it
C．before it is thrown away	D．whenever they use it

From the passage we know that _    ___.

A．a few years ago, there was no smog at all

B．today people don’t have to talk to each other in a loud voice

C．people are making rules in order to fight pollution

D．people can only use rules to fight pollution