[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]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]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]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. shares the same view with the scientists
B. is uncertain of its occurrence
C. rejects it as being ungrounded
D. thinks that it will destroy the world soon

[单项选择]That boys suffer more from air pollution can possibly be justified by the fact that ______.


A. the male have larger bones than the female
B. women can manufacture blood more efficiently than men
C. men usually breathe more deeply than women
D. women breathe as often as men

[单项选择]I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.


A. while
B. since
C. after
D. as

[单项选择]Because of the reduction of air pollution, this city now is a good place（）
A. where to live
B. which to live
C. to live
D. to be lived