5．We sometimes think global warming or climate change is a problem very far away from our lives，and that only the government needs to worry about it．But it's hardly possible to completely stay out of it-scientists are now 95percent sure that humans have been the"dominant cause"of global warming trends since the 1950s．
One of the conclusions of a report released on Sept 27by the United Nations says that human activities have caused global temperatures to rise by 0.89 0C between 1901and 2012．That might not seem like a lot，but the truth is that a major part of that heat has been absorbed into the oceans，which is not surprising given that they cover two thirds of Earth's surface．Also，water has a much greater capacity （容量） to absorb heat than the air does，according to The Economist．
While many greenhouse gases occur naturally and are needed to keep the Earth warm enough to support life，humans'use of fossil fuels is the main source of excess （多余的） greenhouse gases．According to CNN，by driving cars，using electricity produced by burning coal and oil or heating our homes with coal or natural gas，we release a large amount of greenhouse gases into the atmosphere．
Your body can barely feel a difference of 0.89 0C，but the Earth's ecosystems are so sensitive that even small changes can disturb them．It often starts with the smallest creatures at the bottom of the food chain，eventually affecting bigger animals，many of which could end up becoming extinct．
Global warming is also linked to an increase in extreme weather．A larger amount of carbon dioxide traps more energy inside the atmosphere．This changes the patterns of storms and rainfall in many regions and can lead to droughts and floods．Worse still，melting sea ice in warmer oceans is causing sea levels to rise at a speed of more than three millimeters per year，according to The Guardian，which also increases the risk of flooding．
"The report should serve as another wake-up call that our activities today have a profound impact on society，not only for us，but for many generations to come，"French Michel Jarraud，secretary-general of the World Meteorological Organization，said at a news conference．

68．The underlined word"dominant"in the first paragraph means"D"．
A．common     B．indirect    C．secondary    D．leading
69．Which of the following statements is TRUE according to the passage？C
A．Greenhouse gases have been proven to harm merely the Earth．
B．There is little we can do to prevent global warming．
C．Global warming can increase the chances of droughts and floods．
D．The hugeness of oceans makes them better absorbers of heat than the air．
70．The rise in global temperatures between 1901 and 2012D．
A．is more harmful to smaller creatures than bigger ones
B．is not serious because most of the extra heat has been absorbed by the oceans
C．has made the Earth's ecosystems more sensitive to changes
D．is likely to cause many species to become extinct
71．What is Michel Jarraud's attitude toward the report released by the UN？B
A．Negative． B．Supportive． C．Doubtful． D．Uninterested．

分析 本文主要講述了全球變暖不是只有政府才關(guān)心的事，它與我們每個人都息息相關(guān)．科學(xué)家認(rèn)為人類是20世紀(jì)50年代以來全球變暖的主要原因．全球變暖可能會導(dǎo)致干旱和洪水，使很多物種滅亡．因此，我們應(yīng)該敲響警鐘，愛護(hù)環(huán)境．

解答 68．D 詞義辨析題．根據(jù)第一段But it's hardly possible to completely stay out of it-scientists are now 95percent sure that humans have been the"dominant cause"of global warming trends since the 1950s．可知現(xiàn)在科學(xué)家可以95%確定人類是20世紀(jì)50年代以來全球變暖的主要原因．由此推知，"dominant"的意思是"主要的"．故選D．
69．C 細(xì)節(jié)理解題．根據(jù)第五段This changes the patterns of storms and rainfall in many regions and can lead to droughts and floods．可知全球變暖改變了許多地區(qū)的風(fēng)暴和降雨模式和可能導(dǎo)致干旱和洪水．故選C．
70．D 細(xì)節(jié)理解題．根據(jù)第四段It often starts with the smallest creatures at the bottom of the food chain，eventually affecting bigger animals，many of which could end up becoming extinct．可知在1901年到2012年之間，全球氣溫上升可能會導(dǎo)致許多物種滅絕．故選D．
71．B 推理判斷題．根據(jù)最后一段The report should serve as another wakeup call that our activities today have a profound impact on society，not only for us，but for many generations to come．可知Michel Jarraud認(rèn)為聯(lián)合國的報(bào)告對我們有提醒作用，所以是支持該報(bào)告的．故選B．

點(diǎn)評 本文考察學(xué)生的理解推斷能力以及細(xì)心程度，只要抓住文章的關(guān)鍵詞，采用尋讀的方法查找細(xì)節(jié)，就能找到正確答案．

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