题目内容：

    Air pollution comes from factories, power stations and cars.Chemicals in the smoke from power stations cause a lot of damage(损害;毁坏) They can travel hundreds of miles in the wind before falling to the ground in the rain.And this "chemical rain" gradually destroys trees in the forests and kills fish in the lakes.In Germany, over 50% of the country's trees had been damaged by the year 1986.

Time and time again there are serious accidents that pollute the air.In 1986 there was a serious accident at a nuclear power station in Russia.A cloud of radiation flew across the whole Europe.It is said that 125, 000 people died in Russia as a result of illness caused by this accident.

In 1984 there was a serious accident at a factory in India and a cloud of dangerous gas covered the town of Bhopal.Over 2, 500- people were killed that night, and hundreds of thousands of people were injured(受伤的). Many of the injured lost their sight.

1.Air pollution comes from__________.

A.factories B.power stations C.cars D.all of the above

2.According to the passage, which sentence is right?

A.“Chemical rain” is good for the trees.

B.Chemicals in the smoke from power stations are very safe.

C.“Chemical rain” is bad for our environment.

D.Chemicals in the smoke from power stations can't travel far in the wind.

3.In Germany, how many trees had been damaged by the year 1986?

A.a quarter B.A half C.Three quarters. D.A third.

4.From the sentence “Many of the injured lost their sight.”we can know__________.

A.the gas covered the town of Bhopal at that -time was poisonous(有毒的)

B.gradually the injured could see everything

C.many of the injured couldn't see anything any more

D.Both A and C