[单项选择]Such problems ______ air pollution and traffic jams are becoming more and more serious in some big cities.
A. like
B. about
C. as
D. of

[单项选择]Such problems _______ air pollution and traffic jams becoming more and more serious in some big cities.
A. like
B. about
C. as
D. of

[单项选择]According to Nigel, most problems of air travel are caused by （）.
A. unfavorable weather conditions.
B. airports’ handling capacity.
C. inadequate ticketing service.
D. overbooking.

[单项选择]There was a traffic jam, but she （　） get to the destination in time
A. could
B. might
C. ought to
D. was able to

[单项选择]______ the traffic jam, we would have caught our train.
A. But for
B. Because of
C. By means of
D. Due to

[单项选择]______ in the traffic jam, he got to school very late this morning.
A. Having caught
B. Be caught
C. Being caught
D. Caught

[单项选择]There was a traffic jam, but she ______ get to the destination in time.
A. could
B. might
C. ought to
D. was able to

[单项选择]If I had not been _____ by the traffic jam, I would have been there by then.


A. interfered
B. postponed
C. delayed
D. prevented

[单项选择]The author mentions people dying of air pollution in ______.


A. Illinois
B. Pennsylvania
C. New Jersey
D. Washington

[单项选择]Air pollution causes airplane accidents because ______.


A. pilots become ill
B. visibility is reduced
C. engines fail.
D. the air is too hot

[单项选择]

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 traffic. In fact, the very climate of the entire earth may be infected by air pollution. 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"—conserving heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degree, much of the popular ice cap will melt and
A. raising the world's temperature only a few degrees would not do much harm to life on earth
B. lowering the world's temperature merely a few degrees would lead many major farming areas to disaster
C. almost no temperature variations have occurred over the past decade
D. the world's temperature will remain constant in the years to come