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Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.
Alike
Bas
Cof
Dabout
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更多 “Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.AlikeBasCofDabout” 相关考题
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A、conditionB、inventionC、pollutionD、position
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B.spoilt
C.destroyed
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问答题Directions： Please write an essay in about 150 words entitled “Water Shortage” based on the following outline. The first sentence has been given. Outline： （1）Water shortage has become much more serious than before. （2）The chief reasons for water shortage. （3）My suggestions.
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单选题The structures designed by Ralph C. Harris were fifteen-and seventeen-story buildings, and for their time, were some of the larger and more luxurious hotels and residences in existence.A
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era, they were some of the larger and more luxurious hotels and residencesC
era, were some of the largest and more luxurious hotels and residencesD
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VHF communications are basically line of sightB
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sea water absorbs the radiated energy
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问答题Directions： Cars play an important role in modern society. But they are also responsible for a good part of air pollution in big cities. Write an essay on car and air pollution and base your composition on the outline below: （1）the serious problem of air pollution caused by cars; （2）your suggestions on how to deal with the problem. You should write about 150 words neatly on the ANSWER SHEET.
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问答题Directions： Cars play an important role in modern society. But they are also responsible for a good part of air pollution in big cities. Write an essay on car and air pollution and base your composition on the outline below: （1）the serious problem of air pollution caused by cars; （2）your suggestions on how to deal with the problem. You should write about 160-200 words neatly on the ANSWER SHEET.
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单选题As indicated in the passage, the water problem _____.A
has been exaggerated by some experts in the fieldB
is underestimated by government organizations at different levelsC
poses a challenge to the technology of building reservoirsD
is already serious in certain parts of the world
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单选题What is the passage mainly about?A
How to fight air pollution in big cities.B
How to avoid air pollution in big cities.C
How to breathe fresh air in big cities.D
How serious air pollution is in big cities.
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单选题Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.A
likeB
asC
ofD
about
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单选题Early models of the flash-type evaporators used a separate shell-and-tube heat exchanger as the air ejector condenser.More recent models use a combined air ejector condenser with the（）A
distilling condenserB
salt water feed heaterC
distillate coolerD
flash chamber
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comfortableB
difficultC
differentD
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the members studied the problem more carefullyB
the problems were more carefully studiedC
the problems could be studied with more careD
the members study the problem more carefully
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单选题When a refrigeration compressor has developed a high head pressure as a result of a refrigerant overcharge, you should （）.A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some refrigerant from the system
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单选题If the compressor-discharge temperature is higher than the receiver temperature（）A
increase the amount of cooling water to the condenserB
decrease the amount of cooling water to the condenserC
add more refrigerant to the systemD
remove some of the refrigerant from the system
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单选题According to the report, air pollution in big cities _____.A
can be more serious than Chernobyl nuclear disasterB
cannot be compared with the disaster in ChernobylC
can release as damaging radiation as the Chernobyl disasterD
can be more serious than we used to think
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问答题Practice 4 The problem of pollution is also of great social concern. Continued population increase, accompanied by a rise in the level of living standards, not only threatens to exhaust American resources but pollutes the environment to such an extent that production in the thickly settled area is impossible without damaging the health of the local residents. Smog, once an urban annoyance, is now recognized as a health risk, and the automobile has been pinpointed as the principal culprit. Heavy industries have been blamed for river, soil, air, noise and visual pollutions. DDT and other chemical remedies have been doing more ecological harm than the good that they may have brought along. Several decades ago, Americans dumped raw sewage into rivers and many industrial plants are now still dumping chemical pollutants into lakes, rivers and oceans. Oceans used to be and are still being considered to be a reserve of seafood. Today, after the oceans have become the home of all pollutants, this use of the oceans is being reduced at an alarming rate. The worst pollution threat is concentrated in and near large cities. There the people-made pollutants increasingly surpass the ability of air and water to dilute (冲淡；稀释) the contaminants (污染物) to safe levels. The natural ecological cycle depends on plants, which absorb some pollutants and release oxygen to the air. But near large cities, natural vegetation becomes scarce, and introduced trees, ornamental shrubs and gardens are far from adequate in absorbing motor vehicle and industrial air pollutants. Finally, some pollutants, most notably atomic waste, may continue to contaminate air, land, and water for thousands of years. Therefore, ecocrisis—ecocatastrophe or ecocide—has been for some time one of the major concerns of not only the ecoactivists and environmentalists, but of many scientists of other fields and the government authorities of many countries as well.
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