According to the author,

A． war is the only way to solve international 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 survive

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参考答案

答案解析

定位：根据题干信息无法定位。只能将选项一一与文中信息进行比对来判断。
解析：A项 “战争是解决国际争端的唯一方式”显然与文章立意相悖，排除；B项“由于武器的改进，战争将会变得越来越不危险”，根据作者在第一段中对核武器、生化武器的阐述可知该项不正确；C项“人类要想不发生战争就无法生存”也错误，否则作者就不会倡导人类消除战争了；D项“如果人类要生存就必须消除战争”正确，这也是第一段中“要么就是人类废止战争，要么就是战争摧毁人类”的意思。故选D。

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1 Questionsare based on the following passage.
A useful definition of an air pollutant is a compound added directly or indirectly by humans to the atmosphere in such quantities as to affect humans, animals, vegetation, or material adversely(有害地.. Air pollution requires a very flexible definition that permits continuous change. When the first air pollution laws were established in England in the fourteenth century, air pollutants were limited to compounds that could be seen or smelled--a far cry(悬殊的差别. from the extensive list of harmful substances known today. As technology has developed and knowledge of the health aspects of various chemicals has increased, the list of air pollutants has lengthened. In the future, even water vapor(水蒸气. might be considered an air pollutant under certain conditions.
Many of the more important air pollutants, such as sulfur oxides, carbon monoxide, and nitrogen oxides, are found in nature. As the Earth developed, the concentrations (浓度. of these pollutants were altered by various chemical reactions; they became components in biogeochemical( 生物地球化学. cycles. These serve as an air purification scheme by allowing the compounds to move from the air to the water or soil. On a global basis, nature's output of these compounds dwarfs that resulting from human activities. However, human production usually occurs in a localized area, such as a city.
In this localized region, human output may be dominant and may temporarily overload the natural purification scheme of the cycles. The result is an increased concentration of noxious( 有害的. chemicals in the air. The concentrations at which the adverse effects appear will be greater than the concentrations that the pollutants would have in the absence of human activities. The actual concentration need not be large for a substance to be a pollutant; in fact the numerical value tells us little until we know how much of an increase this represents over the
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A． water vapor is an air pollutant in localized areas

B． the definition of air pollution will continue to change

C． a substance becomes an air pollutant only in cities

D． most air pollutants today can be seen or smelled

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2 In what way can natural pollutants play an important role in controlling air pollution?

A． They function as part of a purification process.

B． They are dwarfed by the pollutants produced by human activities.

C． They are less harmful to living beings than are other pollutants.

D． They have existed since the Earth developed.

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3 According to the passage, the numerical value of the concentration level of a substance is only useful if

A． the other substances in the area are known

B． it is a localized area

C． it can be calculated quickly

D． the naturally occurring level is also known

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