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.
【C11】
选项 A、Current
B、Geographical
C、Financial
D、Natural
答案D
解析 篇章题。上下文理解题。本句之后的例子“Pinatubo火山爆发”表明了此为什么样的event。火山爆发是一种自然现象，因此，选项natural“自然的”，为正确答案。natural意为“自然界的”，指属于、关于或涉及自然界，如：a natural environment自然环境。natural也表示“非后天的，天生的”，如：Love of power is natural to some people．有些人天生就热爱权力。current意为“当前的，现代的，流行的”，指属于现在这个时期的，如：Young people should keep themselvesinformed of current events．年轻人应该了解时事。火山爆发是一种自然现象，和是否具有当前性无关。geographical也作geographic，表“地理学的，地理的”，指关于地理(学)的或某地的地质情况，如：geographical latitude地理纬度。financial表示“财政的，金融的”，常涉及大规模金钱的交易，如：Many computer software corporations areexperiencing financial reverses．许多计算机软件公司在经济上遇到了挫折。由此可见，这几个选项都不合题意。
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