Unit4_Global_warming课件10(新人教版选修6）.ppt

Unit 4 Global warming;1. 重点单词拼写;词汇过关;词汇过关;词汇过关;短语习得;短语习得;短语习得;短语习得;重点句型;重点句型;重点句型;1. It is a rapid increase compared to most natural changes. (P26) compare...to与……相比较，此处过去分词短语compared to 作状语。 Compared to/with most women, she is very lucky. 与大多数妇女相比，她很幸运。 【词语辨析】compare...to / compare...with  compare...to 把……比喻成…… We often compare children to flowers.  我们常把儿童比作花朵。 compare...with... 把……与……作比较 If you compare this dictionary with that one, you’ll find many differences. 如果你把这本字典和那本比较一下，你就会发现许多不同之处。 When compared with the size of the whole earth, the biggest ocean; doesn’t seem big at all. 2. How has this come about and does it matter? (P26) 这种温度的增长是怎么产生的呢？会产生什么影响呢？ come about: 发生，造成 相当于happen  Can you tell me how the accident came about?  你能告诉我事情是怎么发生的呢？ With the use of electricity, great changes have come about in our life. 随着电的使用，我们的生活发生了很大变化。 3. The problem begins when we add huge quantities of extra carbon dioxide to the atmosphere by burning fossil fuels. (P26) 而当我们因为烧化石燃料而使大气层中增加了大量额外的二氧化 碳时，问题就来了。 quantity ［U］与(质量quality相对); He prefers quantity to quality when food is concerned. 关于食物，他讲究量不讲究质。 The police found a quantity of/quantities of drugs at his home. 警察在他家发现了大量的毒品。 【提示】短语a(large) quantity of 或(large) quantities of后既可跟可数名词的复数也可跟不可数名词。“a quantity of /quantities of +名词”构成主语时，谓语动词的数通常根据quantity的数来确定。 With more forests being destroyed, huge quantities of good earth are being washed away each year. 4. Greenhouse gases continue to build up in the atmosphere. (P27)  build up 逐步建立，增加，增进 The clouds are building up. 云正在密集起来。 He built up his strength again after an illness. ; 他病后逐步恢复了体力。 Taking exercise will build up your strength.  锻炼可以增强体质。 5. Even if we start reducing the amount of carbon dioxide and other greenhouse gases, the climate is going to keep on warming for decades or centuries. (P27) keep on +doing sth. 继续做…… They keep on working although they are tired.  他们虽