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  3. During the last 15 years, the Earth’s surface temperature rose at a rate of 0.04℃ a decade, far slower than the 0.18℃) increase

During the last 15 years, the Earth’s surface temperature rose at a rate of 0.04℃ a decade, far slower than the 0.18℃) increase

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问题     During the last 15 years, the Earth’s surface temperature rose at a rate of 0.04℃ a decade, far slower than the 0.18℃) increase in the 1990s. Meanwhile, emissions of carbon dioxide rose【C1】________This pause in warming has raised【C2】________in the public mind about climate change. A few skeptics say that global warming has stopped. Others argue scientists’ understanding of the climate is so flawed that their judgments cannot be【C3】________ with any confidence. A convincing explanation of the pause therefore【C4】________both to a proper understanding of the climate and to the【C5】________of climate science.
    As evidence piled up that temperatures were not rising much, some scientists【C6】________it as a pause. The temperature had fallen for much longer periods twice in the past century or so,【C7】________the general trend was up. Variability is part of the climate system and a 15-year【C8】________was not worth getting excited about.
    An【C9】________way of looking at the pause’s significance was to say there had been a slowdown. Most records don’t include measurements from the Arctic, which has been warming faster than anywhere else. Using satellite data to【C10】________the missing Arctic numbers, scientists put the overall rate of global warming at 0.12℃ a decade. A study by NASA puts the "Arctic【C11】________over the same period【C12】________lower, at 0.07℃ a decade, but that is still not【C13】________.
    It is also worth remembering that average warming is not the only【C14】________of climate change. According to a study, the number of hot days, the number of extremely hot days and the【C15】________of warm periods all【C16】________ during the pause. A more stable average temperature hides wider extremes.
    Still, attempts to【C17】________that stable average have not been convincing, partly because of the conflict between【C18】________temperatures and rising CO2 emissions, and partly because observed temperatures are now falling【C19】________the range climate models predict. The models embody the state of climate knowledge. If they are wrong, the knowledge is probably【C20】________too. Hence, scientists still attempt hard to interpret the pause.
【C7】
选项 A、so that
B、now that
C、if only
D、even though
答案D
解析 空格前后分句中的fallen(下降)和up(上升)在语义上相对，两个分句间存在一定的转折关系。选D项even though“尽管”，引导的从句内容通常是真实的、与主句情况不相符的信息。A项so that“以致”引导目的或结果状语从句，体现的逻辑与文章不符。B项now that “因为”代入后表明空格后分句是前一分句的原因，逻辑也不对。C项if only “要是……就好了”引导的内容是不可能实现的愿望或假设，代入后表明“气温总体趋势上升”是虚拟的情况，与真实情况不一致。
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