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  3. The summer’s heat waves baked the eastern United States, parts of Africa and eastern Asia, and above all Russia, which lost mill

The summer’s heat waves baked the eastern United States, parts of Africa and eastern Asia, and above all Russia, which lost mill

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问题     The summer’s heat waves baked the eastern United States, parts of Africa and eastern Asia, and above all Russia, which lost millions of acres of wheat and thousands of lives in a drought worse than any other in the historical record. These far-flung (广布的) disasters are【C1】______the question of whether global warming is causing more weather【C2】______. Although in most people’s opinion, these are【C3】______disconnected, the collective answer of the scientific community can be boiled down to a【C4】______word: probably.
    "The climate is changing," said Jay Lawrimore, chief of climate analysis at the National Climatic Data Center. "Extreme events are occurring with higher【C5】______, and in many cases with【C6】______intensity." He described excessive heat, in【C7】______, as "consistent with our understanding of how the climate【C8】______to increasing greenhouse gases. "
    Theory suggests that a world【C9】______up because of those gases will feature heavier rainstorms in summer, bigger snowstorms in winter, more【C10】______droughts in at least some places and more record-breaking heat waves. Scientists and government reports say the statistical【C11】______shows that much of this is starting to happen.
    But the averages do not necessarily make it easier to link specific weather events,【C12】______a given flood or hurricane or heat wave,【C13】______climate change. Most climate scientists are reluctant to go that far, noting that weather was【C14】______by remarkable variability long before humans began burning fossil fuels and【C15】______much greenhouse and other exhaust gases into the【C16】______"If you ask me, do I think the Russian heat wave has to do with climate change, as a【C17】______the answer is yes," said Gavin Schmidt, a climate researcher【C18】______NASA in New York. "If you ask me as a scientist【C19】______I have proved it, the answer is no—at least not【C20】______."
【C14】
选项 A、characterized
B、marked
C、recognized
D、signaled
答案A
解析 动词辨析题。前面的句子中提到，普通人不必将某个比较极端的天气现象与气候变化联系起来；而本句承接上一句，表达的是连科学家们都不愿意这样认为，因为他们注意到早在人类做出某些污染环境的举动之前，天气就是多变的。characterized意为“以……为特征”，在这里表示“气候正是以多样性为特征的”。
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