2. 外语
  3. The warming of the Earth【C1】______over the last 100 years will be due to a combination of many factors. Warming due to the incre

The warming of the Earth【C1】______over the last 100 years will be due to a combination of many factors. Warming due to the incre

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问题     The warming of the Earth【C1】______over the last 100 years will be due to a combination of many factors. Warming due to the increase in greenhouse gases【C2】______determined so far. 【C3】______, projections of greenhouse warming do not rest on recent observations, they come from【C4】______understanding of the climate system. A【C5】______of simple and complex computer models【C6】______over the last 30 years to put together knowledge of many climate processes.
    【C7】______to some scientific opinion, current models do a reasonable job of【C8】______today’s climate. The difference between summer and winter temperatures, in【C9】______to change in heating from the Sun, is correctly stimulated to【C10】______about 0.5 degrees over much of the planet.【C11】______events provide additional tests of our understanding. For example, the scale and【C12】______of cooling due to the eruption of Mt. Pinatubo were【C13】______by climate models.
    When greenhouse gases are increased in climate models, the response is always an increase in average temperatures and water vapor. Models【C14】______in their result but, in virtually all【C15】______, doubling the amount of carbon dioxide increase global average temperatures【C16】______between 1. 5℃ and 4℃. Why are there some dissenting【C17】______heard on the science of climate change?【C18】______it【C19】______that critics are simply unaware of the depth of the science developed so far.
    Others are concerned【C20】______we do not understand everything about the climate system.
【C15】
选项 A、facts
B、cases
C、reasons
D、occasions
答案B
解析 词汇题。固定搭配词组的词义辨析。常用短语in fact意为“事实上，实际上”，fact在短语中为单数，如：In fact，he didn’t meanthat．实际上他不是那个意思。可见，facts不论用法或意义都不合题意。case意为“情况，状况”，短语in a case表示“在某种情况下”，in all cases意为“在任何情况下”，如：In all cases，the result is the same．在任何情况下，结果都一样。本句表各模型的结果虽然不同，但任何情况下各结果都没超出一个范围。因此，此选项符合题意，为正确答案。常用短语in(all)reason表示“合情合理的，正当的”，如：It is not inreason to ask him to do that．要求他做那种事是不合情理的。此选项用法正确，但含义不符。常用短语on occasion(s)表示“有时，间或”，如：We go to the theatre on occasion．我们有时去看戏。可见，此选项含义和用法均不符题意。
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