2016年6月英语四级考试冲刺模拟题及答案(二)

　　This passage implies thatwar now is _________

　　A.worse than in the past

　　B.as badas in the past

　　C.not so dangerous as in the past

　　D.as necessary as in the past

　　57、In the sentence "To dothis, we need to persuade mankind... "(Line 6, Para.1 ), "this" refers to _________

　　A.solving international problems

　　B.improving weapons

　　C.abolishing war

　　D.living a peaceful life

　　58、From Paragraph 2 we learnthat the author of the passage

　　A.is a supporter of some modem ideologies

　　B.does not think that the adoption of any ideology could prevent war

　　C.believes that the adoption of some ideologies could prevent war

　　D.has no doubt about the truth of any ideologies

　　59、The last paragraph suggeststhat_________

　　A.international agreements can be reached more easily now

　　B.man begins to realize the danger of nuclear war

　　C.nuclear war will definitely not take place

　　D.world opinion welcomes nuclear war

　　60、According to theauthor,_________.

　　A.war is the only way to solve internatioual disputes

　　B.war will be less dangerous because of the improvement of weapons

　　C.it is impossible for man to live without war

　　D.war must be abolished if man wants to survive61、Questions{TSE} are based onthe following passage.

　　A useful definition of an air pollutantis a compound added directly or indirectly by humans to the atmospherein suchquantities as to affect humans, animals, vegetation, or material adversely (有害地.. Air pollution requires avery flexibledefinition that permits continuous change. When the first air pollution lawswere established inEngland in the fourteenth century, air pollutants werelimited to compounds that could be seen or smelled—a farcry (悬殊的差别. from the extensive list of harmful substances known today. Astechnology has developed andknowledge of the health aspects of variouschemicals has increased, the list of air pollutants has lengthened. Inthefuture, even water vapor (水蒸气. might be consideredan air pollutant under certain conditions.

　　Many of the more important airpollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides,arefound in nature. As the Earth developed, the concentrations ( 浓度. of these pollutants were altered byvariouschemical reactions; they became components in biogeochemical (生物地球化学的. cycles. These serve as an airpurification scheme by allowing thecompounds to move from the air to the water or soil. On a global basis,nature'soutput of these compounds dwarfs that resulting from human activities. However,human productionusually occurs in a localized area, such as a city.

　　In this localized region, human outputmay be dominant and may temporarily overload the natural purificationscheme ofthe cycles. The result is an increased concentration of noxious ( 有害的. chemicals in the air. Theconcentrations atwhich the adverse effects appear will be greater than the concentrations thatthe pollutants wouldhave in the absence of human activities. The actualconcentration need not be large for a substance to be apollutant; in fact thenumerical value tells us little until we know how much of an increase thisrepresents over the concentration that would occur naturally in the area. Forexample, sulfur dioxide has detectable health effects at0.08 parts per million(ppm., which is about 400 times its natural level.Carbon monoxide, however, has a naturallevel of 0.1 ppm and is not usually apollutant until its level reaches about 15 ppm.