Question

阅读理解 　　Climate change connected with the reduction of wetlands at the source of the country's two longest rivers, the Yangtze and the Yellow, has reduced the volume of water flowing into them, scientists said． 　　Scientists studied changes over past 40 years to the wetlands on the cold Qinghai-Tibet Plateau in west China where the two rivers have their sources． 　　They found the wetlands on the plateau have shrunk(减少)more than 10 percent over the past four years．The wetlands at the source of the Yangtze have suffered the most, decreasing by 29 percent． 　　About 17.5 percent of the small lakes at the source of the Yangtze have dried up, the scientists said． 　　“The wetland plays a key role in holding water and changing the water volume of the rivers,” Wang Xugen, a researcher, said． 　　“The reduction of the wetland on the plateau is closely connected with global warming,” Wang said, adding that even though rainfall has increased in the area, the reduction of the wetland has reduced the flow of the Yangtze and the Yellow． 　　Records by the weather station at the head of the Yangtze showed yearly rainfall at its source increased from 260 mm during 1991－2000 to 323 mm in the period 2001－2006． 　　“But the increased rainfall didn't lead to more water's flowing into the rivers because the evaporation(蒸发)was so fast as a result of global warming,” Li Shijie, a researcher, said． 　　Another study showed global warming had caused glaciers to get smaller, frozen earth to melt, grasslands to turn yellow and rivers to dry up． 　　The Qinghai-Tibet Plateau used to have 36 000 glaciers covering an area of 50 000 sq km．In the past 100 years, their area has been reduced by 30 percent． (1) According to the passage, the true statement of the following is that ________． [　　] A． the wetlands at the source of the Yellow have decreased by 29 percent B． there's no more water in about 17.5 percent of the small lakes at the source of the Yangtze C． the reduction of the wetland on the plateau has nothing to do with global warming D． yearly rainfall has increased from 260 mm to 323 mm in the past 15 years (2) Which of the following is NOT the result of global warming? [　　] A． Frozen earth melts． B． Evaporation becomes faster． C． Sea level rises． D． Plants grow better in greenhouses． (3) The area that the glaciers of the Qinghai-Tibet Plateau cover is now about ________ sq km． [　　] A． 35000 B． 12000 C． 15000 D． 17 000 (4) In the passage, ________ plays a most important part in holding water and changing the volume of the rivers． [　　] A． yearly rainfall B． the evaporation C． the wetland D． climate change

Answer 1

答案：1．B;2．D;3．A;4．C;
解析：

(1)	细节理解题。由文章的第3段最后一句话可知A项错误；根据第四段内容可知，B项正确；由第六段第一句话可知，C项错误；根据第七段叙述可知，D项错误。对关键句子理解很重要。难度适中。
(2)	细节理解判断题。由倒数第二段可以知道D项正确，A项是全球变暖的原因，所以排除；由倒数第三段可以排除B项。难度适中。
(3)	数字计算题。由文章最后一段的叙述可以计算出，正确答案应为A。本题易。
(4)	[解析]细节理解题。由文章第五段内容可知，C项正确。本题稍易。 　　[文章大意]全球变暖导致了河流源头湿地的减少，而这种现象又进一步减少了河流的入水量，造成了河流的干旱。