The world's oceans have warmed 50 percen

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问题 The world's oceans have warmed 50 percent faster over the last 40 years than previously thought due to climate change,Australian and US climate researchers reported Wednesday．Higher ocean temperatures expand the volume of water,contributing to a rise in sea levels that is covering small island nations and threatening to destroy the low-lying,densely-populated low regions around the globe.The study,published in the British journal Nature,adds to a growing scientific chorus of warnings about the pace and consequences rising oceans．It also serves as a corrective to a massive report issued last year by the Nobel-winning UN Intergovernmental Panel on Climate Change(IPCC),according to the authors.Rising sea levels are driven by two things:the thermal expansion of sea water,and additional water from melting sources of ice．Both processes are caused by global warming．The ice sheet that sits atop Greenland,for example,contains enough water to raise world ocean levels by seven meters,which would bury sea-level cities from Dhaka to Shanghai.Trying to figure out how much each of these factors contributes to rising sea levels is critically important to understanding climate change,and forecasting future temperature rises,scientists say．But up to now,there has been a puzzling gap between the projections of computer-based climate models,and the observations of scientists gathering data from the oceans.The new study,led by Catia Domingues of the Centre for Australian Weather and Climate Research,is the first to reunite the models with observed data．Using new techniques to assess ocean temperatures to a depth of 700 meters from 1961 to 2003,it shows that thermal warming contributed to a 0.53 millimeter-per-year rise in sea levels rather than the 0.32 mm rise reported by the IPCC.The rise in water levels is especially dangerous for small island nations and__.A.low-lying urban areasB.all coastal citiesC.people who live on the beachD.Shanghai

选项 A.low-lying urban areas
B.all coastal cities
C.people who live on the beach
D.Shanghai

答案 A

解析第一段和第三段。海水水位升高，将威胁到小岛国家，也将淹没地球上一些低洼的人口密集的区域。说人口密集肯定是城市了。第三段举例说，海水水位若升高7米，从孟加拉国的首都达卡到中国的上海，这样的海平面的城市都将被淹没选项D只是一个例子。

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The world's oceans have warmed 50 percen

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