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【正文】 ference in average temperature can make a big difference in climate. During the last Ice Age, the pla was only about five degrees colder than now. 2． ________ It39。 A． The likely reason of global warming B． Global warming—a world problem C． The fast increase in recent years D． What we should do to avoid greenhouse gases producing E． The earth is being warmer F． Different opinions on the cause of global warming 1． ________ Is the world warming up? According to many reports, the answer is yes. Eleven of the hottest years since 1850 appeared between 1995 and 2021. Last year, the United Nation39。 【成才之路】 20212021學(xué)年高中英語(yǔ) unit 5 Canada“ The True North”第 4 課時(shí) Unit Revision 強(qiáng)化練習(xí) 新人教版必修 3 Ⅰ .六選五 根據(jù)短文內(nèi)容，從下面的選項(xiàng)中選出能概括每一段主題的最佳選項(xiàng)。選項(xiàng)中有一項(xiàng)為多余項(xiàng)。s Intergovernment Panel on Climate Change (IPCC) reported the earth was about ℃ warmer than it was in 1850. While this doesn39。s all about the speed at which temperatures are changing. In the past, temperatures moved up or down step by step. But in the 20th century, especially since 1976, temperatures have likely risen more quickly than during any century in the last 1000 years. Warming may bring improved harvests to northern countries such as Canada and Russia. However, many species won39。s average temperature would be － 18℃ rather than the present fortable ℃ . The main greenhouse gases are carbon dioxide, water vapor and some other gases. Burning oil, coal and waste adds to the carbon dioxide, and it has increased 35% since 1850. 4． ________ Many researchers have found that natural forces alone don39。t agree. They think the effect of human produced greenhouse gases is very small pared to the normal changes that the
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