今天是周三，我们一起来做第三部分的概括大意与完成句子题
阅读下面这篇短文后有2项测试任务：（1）第23～26题要求从所给的6个选取项中为第2～5段选择1个正确的小标题；（2）第27～30题材要求从所给的6个选项中选择4个正确选项，分别完成每个句子。请将答案涂在答题卡相应的位置上。
Global Warming
1 Smoke is clouding our view of global warming, protecting the planet from perhaps three-quarters of the greenhouse （温室） 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.2 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）.
4 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℃. 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 greenhouse gases than previously guessed.
5 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.
23 Paragraph 2 .
24 Paragraph 3 .
25 Paragraph 4 .
26 Paragraph 5 .
A Atmospheric Scientists
B The Calculations Made at the Berlin Workshop
C The Previous Calculations of the Effect of Aerosols
D The Scientists' Agreement
E The Authoritative Conclusion
F Greenhouse Gases
（答案见二楼）
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