UNIT 7

G. READING

I. Read the passage and choose the best answer (A, B, C or D).

There are three main (1) ……………… of pollution: air pollution, water pollution and

noise pollution. Air, which is the most important element of our environment for our (2)

……………………, can be polluted in many ways. Smoke in the air from mills, factories

and industry (3) …………………… carbon, monoxide, carbon dioxide, and methane, which

are all poisonous gases. This leads (4) …………………… health problems like asthma and

lung diseases, and the thinning of the ozone layer, which (5) ……………………us from

harmful UV ray. China, the USA, Russia, India, Mexico and Japan are the world leaders in

air pollution (6) ……………………Water is also polluted by the discharge of commercial

and industrial waste. Sewage in drinking water is another (7) ……………………of water

pollution as it contains germs and viruses. The noise of vehicles, mills, and factories can be

really unbearable. This kind of constant sound also (8) ………………headaches, tension, (9)

……..………… stress and migraines. People living next to a building site where there is too

much noise can become sick, as they cannot sleep or relax. This is (10)……………………

noise pollution.

1. A. types

B. kinds

C. models

D. both A & B

2.

A. survival

B. survive

C. surviving

D. survived

3. A. includes

B. include

C. contains

D. contain

4. A. in

B. into

C. to

D. from

5.

A. prevents

B. protects

C. avoids

D. hides

6.

A. emissions

B. emitted

C. emission

D. emitting

7. A. effect

B. cause

C. result

D. consequence

8. A. causes

B. leads to

C. results in

D. all are correct

9.

A. brain

B. mind

C. head

D. mental

10. A. told

B. called

C. said

D. mentioned

II. Read the passage. Answer the questions below.

Scientists have discovered that the ozone layer is getting thinner. Some predict that the

sun’s rays will cause a sharp increase in deaths from skin cancer over the next fifty years.

These harmful rays can also damage the eyes, create wrinkles, and cause other health

problems.

The stratosphere contains a form of oxygen called ozone. Ozone is a molecule composed

of three oxygen atoms. The chemical formula of ozone is 03. Oxygen molecules make up

about 21% of all gases in the Earth’s atmosphere. They consist of two atoms of oxygen and

are labeled 02. Most ozone found in our atmosphere is formed by an interaction between

oxygen molecules and ultraviolet radiation (UV) from the sun. When ultraviolet radiation

hits an oxygen molecule, it may cause the molecule to break apart into single atoms of

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