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Air pollution involves the release into the atmosphere【C1】______ gases, finely divided solids, or finely dispersed liquid aero
Air pollution involves the release into the atmosphere【C1】______ gases, finely divided solids, or finely dispersed liquid aero
admin
2010-01-15
77
问题
Air pollution involves the release into the atmosphere【C1】______ gases, finely divided solids, or finely dispersed liquid aerosols at rates that【C2】______ the capacity of the atmosphere to dissipate them or to dispose【C3】______ them through incorporation into solid or【C4】______ layers of the biosphere. Air pollution【C5】______ a variety of causes, not all of which are【C6】______ human control. Dust storms in desert areas and smoke from forest and grass fires【C7】______ to chemical and particulate pollution of the air. Forest fires that swept the state of Victoria, in Australia, in 1939 caused【C8】______ air pollution in Queensland, more than 2,000 miles (3,000 kilometres) away. Dust blown from the Sahara has been【C9】______ in West Indian islands. The discovery of 【C10】______ in Antarctica, where they have never been used, suggests the【C11】______ to which aerial transport can carry pollutants from one place to another. Probably the most important natural【C12】______ of air pollution is volcanic activity , which at times【C13】______ great amounts of ash and toxic【C14】______ into the atmosphere. The eruptions of such volcanoes as Krakatoa, in the East Indies, Mt. St. Helens, in Washington, and Katmai, in Alaska, have been 【C15】______ to 【C16】______ climatic changes.
Air pollution may affect humans directly, causing a smarting of the【C17】______ or coughing. More indirectly, the effects of air pollution are experienced at【C18】______ distances from the source, as, for example, the fallout of tetraethy lead from urban automobile【C19】______ which has been observed in the oceans and on the Greenland ice sheet. Still【C20】______ directly experienced are the possible effects of air pollution on global climates.
【C18】
选项
A、considerable
B、considering
C、considerate
D、consistent
答案
A
解析
本题一方面需要从上下文语义上进行判断,另一方面也涉及到四个同根词的语义辨析。文章是要表达空气污染的影响在相当远的地方可以感受得到。选项B considering意思为“鉴于,考虑到”,选项 C considerate表示“考虑周到的”,选项D表示“一致的”,选项A considerable表示“相当多的”为本题正确答案。
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0
专业英语四级
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