2. 职称英语
  3. The warming of the Earth【C1】______over the last 100 years will be due to a c

The warming of the Earth【C1】______over the last 100 years will be due to a c

游客2024-10-19  0
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. [br] 【C6】
选项 A、has been used
B、had been used
C、have been used
D、has used
答案 A
解析 语法题。“计算机模型”是被人所运用，因此，可确定本句为被动句，这样，就可排除表主动的选项has used。其次，主语的中心词(a)range为单数，选项have been used又可排除。再者，本文的主导时态为现在时，而本句所涉时间为过去三十年以来，也就是说三十年前至今，那么只有选项hasbeen used表示从过去到现在为止的时间范围，因此，为正确答案。had been used为过去完成时，表示从过去到过去的某个时间为止，不合题意。
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