Air pollution comes from factories, power stations and cars. Chemicals in the smoke from power stations cause a lot of damage（損害；毀壞）. They can travel hundreds of miles in the wind before falling to the ground in the rain. And this “chemical rain” gradually（逐漸地）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 (受傷的). Many of the injured lost their sight.

(   ) 54. Air pollution comes from _____.

A. factories                   B. power stations          C. cars                  D.  A,B and C

(   ) 55. According to the passage, which sentence is right?

A. Chemicals in the smoke from power stations can’t travel far in the wind.

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

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

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

(   ) 56. In Germany, how many trees had been damaged by the year 1986?

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

(   ) 57. What was the result of the accident that happened in Russia in 1986?

A. Over 2,500 people were killed.          

B. Many people couldn’t walk.

C. Many people lost their sight.

D. Compared with (同……比較) the accident in India, more people died.

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