1、Answer keys for Ex.1 on Page 28:,Checking answer I (2m),trend,fuel,state,consume,glance,1,2,2,2,1,Answer keys for Ex.2 on Page 28:,Checking answer II (3m),data, kept on quantities, run out build up, catastrophe come about consequence phenomenon graph per even if resulted in,Discovering useful struct
2、ures,Page 29,Answer key for exercise 1:,It was a scientist called Charles Keeling, who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to1997. it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide.,强调句型,强调句型，你掌握了吗？
3、,一、 It is/was+ 被强调部分 + that+剩余的部分 被强调部分是人 who/whom/ that +剩余的部分 注意 (被强调部分是:主语，宾语，表语或状语) 强调句的连接词一般只用 that ； 强调人时，可用who (主语) 或 whom (宾语). 强调句的时态一般为“It was+that” 强调句的一般疑问句句型：Is / Was +it +所强调的部分+that / who/ whom? 强调句的一般疑问句句型：疑问词 +所强调的部分+that / who/ whom?,1. 我是在街上遇见她的父亲的。(强调在街上) 2. 你是8点开始工作的吗？（强调时间）3. 正
4、是因为她病了，他们才没见她做这项工作。4. 他为什么不能回答这个问题？,It was in the street that I met her father.,Was it at eight oclock that you began to work?,Because she was ill, they didnt ask her to do the job. It was because she was ill that they didnt ask her to do the job.,Why was it that he couldnt answer the question.,（强调原
5、因）,判断是否是强调句是，可把 It is / was that 去掉，剩余部分在不增减任何词的情况下还是一个完整的句子，那么这种句子是强调句。It was in the street that I met her father. In the street I met her father. It was because she was ill that they didnt ask her to do the job. Because she was ill, they didnt ask her to do the job.,二、 not . until . 的强调形式: It is n
6、ot until + 被强调部分 + that . “直到才”， 主要用于强调时间状语的强调句型。 I didnt realize she was a famous film star until she took off her dark glasses. Not until she took off her dark glasses did I realize she was a famous film star. It was not until she took off her dark glasses that I realized she was a famous film sta
7、r.,三、 句子谓语 的强调手段： do / does / did + 动词原形e.g 我的确相信他是老实人。 I do believe that he is an honest man.他们昨天的确去看过你，但没见到你。 They did go to see you yesterday, but failed to meet you.,四、 What +从句+ is / was 是名词从句结构，常用来强调主语、宾语。e.g他最希望的是成为一名飞行员。（强调宾语）,What he wishes most is to become a pilot.,What interested me most
8、 was the beautiful scenery. 给予我们鼓励的是他为我们树立的榜样。（强调主语） What encouraged us was the example he set for us.,What +从句+ is / was 使我最感兴趣的是那美丽的风景。 （强调主语）,巩固练习： 1. It was what he said _disappointed me. 2. Is it in the factory _ this type of cars are produced? 3. Is it the factory _ this type of cars are produ
9、ced ? 4. It is I _ is singing in the garden. 8. It is in the west of China _ there is no doubt _ it is going to rain tomorrow.,that,that,where,who,where,that,10. It was the training _ he had as a young man _ made him such a famous writer.,9. It was 1969 _ the American astronauts succeeded in landing
10、 on the moon.,when,that,when,It is scientists who warned that greenhouse gases would warm the earth by trapping heat energy in the atmosphere. It is the greenhouse effect that gives the earths surface the average temperature of 15 It is fossil fuels that much of the energy used to light and heat our
11、 homes comes from. It is the developed countries that consume the most energy in the world. It is for centuries that carbon dioxide has the tendency to stay in the atmosphere while other greenhouse gases stay in the atmosphere only for a day or less.,Answer key for exercise 2 on page 29:,It is their
12、 very existence that low-lying countries feel is in danger from rising sea levels. It is environmentalists who have tried to stop the earths temperature rising. It is future climate changes and their effects on our environment that scientists want to find out about. It is by several metres that the level of the sea could rise in the years ahead because of global warming. It is outer space that might provide us with new energy sources in the future.,