Unit4GlobalwarmingLearningaboutlanguage课件（新人教选修6）.ppt

人教课标 高二 选修 6 Unit 4;Unit 4 Global warming; Go over the new words and phrases in the previous sections. Then complete each sentence with one of those new words or phrases.;1. Charles Keeling collected _____ on the carbon dioxide content in the atmosphere over a forty-year period. He found that the amount of carbon dioxide _______ increasing during that time.;2. Although we are burning coal in huge _________ every year, we won’t ________ of it for centuries. 3. If the amount of greenhouse gases continues to ________, we could be facing a global ___________.;4. Many scientists believe that global warming has __________ through the burning of fossil fuels. ;6. On the whole the warming of the earth is a ____________ that causes great concern. 7. The _______ shows temperature changes during the 20th century. 8. One hectare of forest can absorb 23 tons of carbon dioxide ____ year.;9. The washing machine uses too much energy, but _______ we buy a more economical one, it would still use too much water. 10. The car accident on the main road yesterday __________ one driver’s death.;由it引导的强调句结构： It is (was)+被强调部分+that (who) + 句子其他部分 注意：此结构强调的成分仅限于主语，宾语和状语。;It was in that city that we met for the first time．;原句：My father did the experiment in the lab yesterday evening．; 强调宾语：It was the experiment that my father did in the lab yesterday evening． ; 强调地点：It was in the lab that my father did the experiment yesterday evening．;It was last night ____ I saw the film Star Wars． A. who B. when C. that D. which; 答案C 强调句的结构是：It + be + 强调部分 + that (who) +主谓句。强调句的连词只有两个，that和who。当强调的部分是人，且为句子的主语时，才用who，其余用that。; 2) It is ten years _____ Miss Green returned to Canada． A. that B. when C. since D. as 答案C 考点是连词用法。本题易误选为A其实本句不是强调句。; 若是去掉 It be … that 还应是一个完整的句子。而本句去掉 It is … that, 只剩下 ten years Miss Green returned to Canada 不成句。因此本句不是强调句。It is