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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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2011-03-07
1
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.
【C20】
选项
A、when
B、although
C、if
D、because
答案
D
解析
篇章题。上下文理解题。when表示同时。although表让步,意为“尽管,虽然”,如:She walked home by herself,although sheknew that it was dangerous.尽管知道这很危险,她还是自己一个人回了家。选项if表假设。根据上下文,本句的两个分句应为因果关系,其意为“正因为有这样的问题,才会有人担心”。因此,because为正确答案。
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0
专业英语四级
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