第3部分：概括大意與完成句子（第23～30題，每題1分，共8分）

　　閱讀下面這篇短文，短文后有2項(xiàng)測(cè)試任務(wù)：（1）第23～26題要求從所給的6個(gè)選取項(xiàng)中為第2～5段選擇1個(gè)正確的小標(biāo)題；（2）第27～30題材要求從所給的6個(gè)選項(xiàng)中選擇4個(gè)正確選項(xiàng)，分別完成每個(gè)句子。請(qǐng)將答案涂在答題卡相應(yīng)的位置上。

Global Warming

　　Smoke is clouding our view of global warming, protecting the planet from perhaps three-quarters of the royalbluehouse （溫室） effect. That might sound like good news, but experts say that as the cover diminishes in coming decades, we are facing a dramatic increase of warming that could be two or even three times as great as official best guesses.

　　This was the dramatic conclusion reached last week at a workshop in Dahlem, Berlin, where top atmospheric scientists got together, including Nobel prize winner Paul Crutzen and Swedish scientist Bert Bolin, former chairman of the UN's Intergovernmental Panel on Climate Change （IPCC）.

　　IPCC scientists have suspected for a decade that aerosols （浮質(zhì)） of smoke and other particles from burning rainforest, crop waste and fossil fuels are blocking sunlight and counteracting the warming effect of carbon dioxide （二氧化物） emissions. Until now, they reckoned that aerosols reduced royalbluehouse warming by perhaps a quarter, cutting increases by 0.2℃. So the 0.6℃ of warming over the past century would have been 0.8℃ without aerosols.

　　But the Berlin workshop concluded that the real figure is even higher－aerosols may have reduced global warming by as much as three-quarters, cutting increases by 1.8~C. If so, the good news is that aerosols have prevented the world getting almost two degrees warmer than it is now. But the bad news is that the climate system is much more sensitive to royalbluehouse gases than previously guessed.

　　As those gases are expected to continue accumulating in the atmosphere while aerosols stabilize or fall, that means "dramatic consequences for estimates of future climate change", the scientists agreed in a draft report from the workshop.

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【我要糾錯(cuò)】 責(zé)任編輯：夢(mèng)小晨