2016高考英语人教新课标一轮复习选修6Unit4练习及答案（基础）

　　高三英语一轮复习 Unit 4 Global warming练习 新人教版选修6

　　Ⅰ.阅读理解

　　(2017·皖南八校第二次联考)

　　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 95 percent 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 27 by the United Nations says that human activities have caused global temperatures to rise by 0.89℃ between 1901 and 2017. 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.

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