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  3. Climate change is supposed to unfold slowly, over decades. But that is not true up in the great white north, as those attending

Climate change is supposed to unfold slowly, over decades. But that is not true up in the great white north, as those attending

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问题     Climate change is supposed to unfold slowly, over decades. But that is not true up in the great white north, as those attending the AAAS meeting’s session on climate change in the Arctic were reminded. Temperatures there are 2°C higher than their long-term average, and the upper layers of parts of the Arctic Ocean are hotter than they have been for at least 2,000 years. Summer sea ice has been vanishing faster than even the gloomiest researchers thought likely, with some now predicting the first completely ice-free summer as soon as the 2020s.
    The Arctic is not, though, isolated from the rest of the world; rapid changes there could have knock-on effects elsewhere. Whether or not that is happening was a question addressed by Jennifer Francis, an atmospheric scientist at Rutgers University. It is a topical subject. Along with much of the rest of America, Chicago endured a fierce and prolonged cold snap in January, in which temperatures fell to -27°C, the lowest since 1884. Meanwhile, Brits at the conference were fleeing a country that had been soaked by the heaviest winter rains in two and a half centuries, and battered by a seemingly endless succession of Atlantic storms and gales.
    Campaigners in both countries have been quick to blame climate change for the rotten weather. But things are rarely so straightforward in climatology. The best Dr Francis could offer was a theory as to why a warmer Arctic might be expected to lead to wilder weather in mid-latitudes, and some tentative but suggestive evidence that this is already happening.
    Her idea rests on the jet stream, a powerful, persistent, high-altitude " river of air" which flows around the world from west to east, affecting the weather as it goes. The jet stream is driven in part by the temperature difference between cold Arctic air and the warmer air of middle latitudes. Because the Arctic is warming more rapidly than the rest of the planet, that difference is shrinking. This ought to produce a less potent jet stream. And a less potent jet stream is a more unpredictable one.
Dr Francis suggests that______.
选项 A、climate change causes bad weather in England
B、things are seldom straightforward in climatology
C、human being is to blame for the change of climate
D、ocean warming may result in bad weather on land
答案D
解析 根据Dr Francis定位到第三段最后一句：The best Dr Francis could offer was a theoryas to why a warmer Arctic might be expected to lead to wilder weather in mid—latitudes，and sometentative but suggestive evidence that this is already happening．题干中的suggest that对应原文offer a theory这部分内容，故答案来自之后：a warmer Arctic might be expected to lead to wilderweather in mid—latitudes，而与该句最接近的是选项[D]ocean warming may result in bad weatheron land。故该题答案为选项[D]。
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