Question

For years scientists have been worried about the effects of air pollution on the earth’s natural conditions. Some believe the air inside many houses may be more dangerous than the air outside. It may be one hundred times worse.

Indoor air pollution can cause a person to feel tired, to suffer eye pain, headache and other problems. Some pollutants(污染物) can cause breathing disorders, diseases of blood and even cancer. Most scientists agree that every modern house has some kind of indoor pollution.

People have paid more attention to the problem now. It is true that when builders began making houses and offices they did not waste energy. To do this they build buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.

As the problem became more serious, scientists began searching for a way to deal with it. They discovered a natural pollution control system for building--green plants. Scientists do not really know how plants control air pollution. They believe that a plant’s leaves absorb or take in the pollutants. In exchange the plant lets out oxygen through its leaves and tiny organizations on its roots. Scientists suggest that all buildings should have one large plant or several small plants inside for every nine square meters of space. Studies of different plants show that each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants. Having green plants inside your house can make it a prettier and more healthy place.

1.Generally speaking, indoor air pollution may be more harmful than the air outside because________.

A. indoor air pollution can often make people seriously ill

B. there may be more harmful gases outside the buildings

C. the air indoors is polluted, which is very harmful

D. man-made building materials give off dangerous gases

2.Some kind of indoor pollution can be found in _______.

A. every modern house     B. every old house

C. all kinds of houses     D. all kinds of offices

3.The indoor air pollution is caused by ______.

A. the building way that the builders want to save energy

B. the man-made building materials and the limit of air-flow

C. the building things that are made of man-made materials

D. the limit of the flow of air between inside and outside

4.The reason why we should use different kinds of plants to clean the air is that ______.

A. plants can let out all kinds of pollutants indoors

B. plants may take in more oxygen which people need

C. plants can absorb all kinds of harmful indoor chemicals

D. plants can make our houses prettier and more healthy

Answer

1.D

2.A

3.B

4.C

【解析】

试题分析：文章关注的是室内空气污染问题。一些科学家认为，室内空气污染要比室外的空气污染更严重。室内空气污染会导致呼吸障碍、血液方面的疾病，甚至有致癌的危险。

1.They also began using man-made building materials. These materials are now known to let out harmful gases.”可知，室内空气污染比室外的空气污染更严重，这是因为人工建筑材料会释放很多的有害气体，故选D。

2.Most scientists agree that every modern house has some kind of indoor pollution.”可知，现代的每一间房屋都存在室内污染的问题，故选A。

3.buildings that limited the flow of air between inside and outside. They also began using man-made building materials. These materials are now known to let out harmful gases.”可知，造成室内污染的原因是空气无法流通，建筑使用的人工建筑材料释放有害气体，故选B。

4.each absorbs different chemicals. So the most effective way to clean the air is to use different kinds of plants.”可知，不同的植物吸收不同的有害化学物质，因此，应该在室内种植不同的绿色植物，故选C。

考点：健康类短文阅读