【正确答案】 B

【答案解析】[听力原文] 6-7
Last week, a United Nations' report said humans are very likely the cause of most of the temperature increases in the last 50 years. It said global warming is undeniable and that the world can expect to feel the effects for centuries to come. The Intergovernmental Panel on Climate Change released the report in Pairs at a conference of climate experts. Representatives of more than 100 governments agreed on the findings. This is the most detailed scientific report to date on global warming and the influence of fossil fuel burning and other human activities. [6] The scientists say there is greater than a 90% chance that greenhouse gases are the main cause of rising temperatures and sea levels. The report also links global warming to other changes including increased dryness in some areas and violent storm patterns. The UN panel released its last climate change report 6 years ago. [7] The scientists say the new report is based on studies done since then and stronger agreement on global warming. The new report makes no policy proposals, but the aim is to press governments and industries to cut the release of carbon dioxide and other gases blamed for trapping heat.
[考点] 本题考查细节信息．题干的核心词是main cause。
[精析] 新闻提到，科学家认为温室气体是气温上升和海平面上升的主要原因，有超过90%的可能是这样。而气温上升和海平面上升就是全球变暖的表现，由此可以推出，全球变暖的主要原因就是温室气体。故选B。

【正确答案】 C

【答案解析】[考点] 本题的设题点在新闻的结尾处
[精析] 新闻提到，科学家说新的报告是以自上一次报告发布后所进行的研究为基础的，并且这次报告在全球变暖问题上达成了更多共识。新的报告有更多的共识，可知上一次报告的共识则较少，故选C。在研究的数量、政策提议和目标问题这几个方面新闻并没有给出比较。