Mr.Smith as well as two of his students ________ the experiment with care at the moment.
A．is doing B．are doing C．does D．do
口算能手系列答案科目：高中英語 來源：2014-2015學年陜西西安慶安高級中學高二下期末英語試卷（解析版） 題型：單項填空
The police warned that anyone ______guilty of taking drugs in that country would be put in prison.
A. to find B. found
C. finding D. having found
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科目：高中英語 來源：2014年北師大版高中英語必修一第二單元練習卷（解析版） 題型：單項填空
For a moment Tom was ________ how to reply to the question.
A．no idea B．not knowing C．puzzling D．at a loss
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科目：高中英語 來源：2014年北師大版高中英語必修一第三單元練習卷（解析版） 題型：單項填空
You can take anything from the shelf and read，but please ________ the books when you've finished with them.
A．put on B．put down C．put back D．put off
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科目：高中英語 來源：2014年北師大版高中英語必修一第三單元練習卷（解析版） 題型：單項填空
The bridge was named ________ the person who contributed a lot of money to it.
A．in honor of B．instead of C．in favor of D．by means of
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科目：高中英語 來源：2014年北師大版高中英語必修一第一單元練習卷（解析版） 題型：單項填空
—Why did Tony leave our company?
—He was________ a better job at Haier.
A．provided B．offered
C．protected D．owned
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科目：高中英語 來源：2014年北師大版高中英語必修一第一單元練習卷（解析版） 題型：單項填空
Yesterday I went ________ I spent the holiday last summer.
A．where B．when C．what D．which
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科目：高中英語 來源：2014學年哈師大附中高一上期中考試英語試卷（解析版） 題型：單項填空
The exam result will be _______ on Friday afternoon.
A. put up B. put away
C. put off D. put on
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科目：高中英語 來源：2014-2015學年黑龍江省安達市高二第一次月考試卷英語試卷（解析版） 題型：閱讀理解
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（吸收）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 healthier 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．man-made building materials give off dangerous gases
C．there may be more harmful gases outside the buildings
D．the air indoors is polluted, which is very harmful
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 limit of the flow of air between inside and outside
B．the building way that the builders want to save energy
C．the building things that are made of man-made materials
D．the man-made building materials and the limit of air-flow
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 （氧氣）which people need
C．plants can absorb all kinds of harmful indoor chemicals
D．plants can make our houses prettier and more healthy
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