填空题

SECTION A
In this section you will hear a mini-lecture. You will hear the lecture ONCE ONLY. While listening to the lecture, take notes on the important points. Your notes will not be marked, but you will need them to complete a gap.filling task on ANSWER SHEET ONE after the mini-lecture. Use the blank paper for note-taking.
Now listen to the mini-lecture.
Air Pollution
Air pollution is typically caused by (1)_____ran by the factories of modern industrial na- (1)_____
tions, automobiles, trains, planes, and buses. Each year, plenty of wastes get into the air.
It does great harm to people, (2)_____the eyes and chests. Many people become ill, and the (2)_____
death raw among elderly people and people with lung disorders climbs rapidly caused by a weather(3) (3)_____
_____called a temperature (4)_____. (4)_____
At least half of the pollutants in the air come from the engines of motor vehicles. As they burn
fuel, they give off carbon monoxide as a waste, a colorless, odorless gas, and a deadly poison. This
problem can be solved by special devices designed to make the engine burn the fuel more (5)_____. (5)_____
Some manufacturers use electricity or other means that will reduce pollution.
Coal and oil are also an important resource of waste. It is irritating to the (6)_____. Sonic (6)_____
cities have passed laws that allow coal and oil to be burned only if their sulfur content is low. There
is no air pollution of the ordinary kind. But the (7)_____materials in these plants could present a (7)_____
danger in an accident. Also, there is a problem in disposing of the radioactive wastes in a way that will not endanger the environment.
Another type of pollution, called heat pollution, is caused by both the fuel-burning and (8) (8)_____
_____plants. It may also kill fish and their eggs, or (9)_____with their growth. (9)_____
Totally, physicists, many power plants and (10)_____should work together to study new (10)____
ways of generating electricity.