题目内容
（请给出正确答案）
Air pollution, together with overpopulation, ______ many problems in big cities today.
A．are causing -
B．is causing
C．are caused
D．is caused
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更多“Air pollution, together with o…”相关的问题
A.air pollution
B.acid rain
C.water pollution
D.large oil spill
Because of the reduction of air pollution, this city now is a good place ______.
A．to live in
B．to be lived
C．where to live
D．which to live
Air pollution is the most serious kind of pollution because ______.
A．it's bad for all living things in the world
B．it makes much noise
C．it makes our rivers and lakes dirty
D．it makes us angry more easily
A.profit
B.profile
C.profess
D.proffer
This passage is primarily about______.
A．the greenhouse effect
B．the burning of fossil fuels
C．the potential effect of air pollution
D．the likelihood of a new ice age
The author believes that carpooling ________.
A．can give help to those without cars
B．can save people money and time
C．can save energy resources and reduce air pollution
D．can promote friendship among drivers
Scientists counted the number of stars________.
A．to illustrate the impact of light pollution
B．to compare air quality in different areas
C．to see how the sky has changed with time
D．to arouse public interest in space
根据以下内容回答题，
There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic．At present，we realize that although these are the．areas with the worst air pollution，the problem is literally worldWide．On several occasions over the past decade，a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile tmmc．In fact，the very climate of the entire earth may be infected by air poilu-tion．Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels（coal and oil）is creating a“greenhouse effect”——con-serving heat refleeted from the earth and raising the world’S average temperature．If this view is correct and the worid’s temperature is raised only a few degrees，much of the polar ice cap will melt and cities such as New York，Boston，Miami，and New Orleans will be in water． Another view．1ess widely held，is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature——a result that would be equally disas-trous．A drop of just a few degrees could create something close to a new ice age，and would make agriculture difficult or impossible in many of our top fanning areas．Today we do not know for sure that either of these conditions will happen（though one recent government report drafted bv experts in the field concluded that the greenhouse effect is#cry possible）．Perhaps，if we are lucky enough，the two tendencies will offset each other and the world’s temperature will stay about the same as it is now．
As Dointed out at the beginning of the passage，people used to think that air pollution__________ ．
A.caused widespread damage in the countryside
B.affected the entire eastern half of the United States
C.had a damaging effect on health
D.existed merely in urban and industries areas
Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth's temperature—a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. At present we do not know for sure that either of these conditions will happen (though one recent government report prepared by experts in the field concluded that the greenhouse effect is very likely). Perhaps, if we are very lucky, the two tendencies will offset each other and the world's temperature will stay about the same as it is now.
This passage is mainly concerned with______.
A．the greenhouse effect
B．the potential effect of air pollution
C．the burning of fossil fuels
D．the probability of a new ice age
