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根据短文内容选择可以填入空白处的最佳答案。(Choose the best answers to complete the passage.)

  Pollution means contaminating the Earth's environment with materials that people's   1   and lower their quality of life.Pollution can also   2   animals and plants.  3   many different forms of pollutions.The three   4   are air pollution, land and water pollution.

  Air pollution comes from different sources-not   5   of them are man-made.For example, dust storms in deserts and the smoke from forest fires are natural sources of air pollution.In urban areas, dirty air is more noticeable   6   the fumes from traffic and the waste from factories.Air pollution can   7   humans by causing sore eyes and respiratory   8  , especially in children and the elderly.

  Land pollution is caused by the deposit of soil waste that can't   9   quickly or at all.Land pollution can affect the lives of animals and plants, and it makes the environment look very   10   Recycling and reusing materials can help   11   the amount of land pollution.Other methods include landfill-using the rubbish to make new land-and burning the rubbish,   12   these two methods can pollute the water and air.

  Water pollution results when substances are released into lakes, rivers, oceans, ect.Stay in the water or   13   at the bottom.This form of pollution may also begin in the air if the air is polluted and cause acid rain.When it   14  , the rain will then pollute the water in lakes, rivers, oceans, ect.Soil erosion is one example of natural water pollution and can cause problems   15   the soil blocks the flow and leads to flooding.Pollution from human sources includes chemicals, pesticides, waste from factories and human sewage.

(1)

[  ]

A.

healthy

B.

healthily

C.

health

D.

unhealthy

(2)

[  ]

A.

care

B.

harm

C.

threat

D.

protect

(3)

[  ]

A.

They are

B.

There is

C.

It is

D.

There are

(4)

[  ]

A.

major group

B.

majority group

C.

major groups

D.

majority groups

(5)

[  ]

A.

both

B.

either

C.

none

D.

all

(6)

[  ]

A.

because of

B.

though

C.

because

D.

since

(7)

[  ]

A.

effect

B.

afford

C.

affect

D.

effort

(8)

[  ]

A.

matters

B.

pollution

C.

questions

D.

problems

(9)

[  ]

A.

breaking up

B.

broken up

C.

broken down

D.

burned up

(10)

[  ]

A.

bad

B.

badly

C.

good

D.

well

(11)

[  ]

A.

recycle

B.

reduce

C.

destroy

D.

reuse

(12)

[  ]

A.

but

B.

and

C.

so

D.

or

(13)

[  ]

A.

build up

B.

build into

C.

build out

D.

build down

(14)

[  ]

A.

is going to rain

B.

rains

C.

will rain

D.

is raining

(15)

[  ]

A.

unless

B.

until

C.

though

D.

if

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