必修六英语课本知识点话题29环境保护.ppt

* * 1. has→ have 因主语levels为复数形式，故用have。 2. 在last前加the 指在“最近多少年里”习惯上说in /over the last…years，且与完成时连用。 3. 去掉called前的was 过去分词called作后置定语。 4. from→ between 指代前面的from 1957 to 1997。表示“在……期间”，用介词between。 5. down→ up 根据下文“from around 315 parts to around 370 parts per million”可知应该是上升(go up)，而非下降(go down)。 6. scientist→ scientists “所有的科学家”，肯定不止一个，所以用复数。 7. He→ They 指代前句的scientists，用复数形式。 8. have→ has 强调句式，强调主语the burning of more and more fossil fuels，根据主谓一致，与the burning一致应为单数，故改用has。 9. for→ to/towards 表示“对……的态度”，为the attitude to/towards…。 10. difference→ different 作表语，应用形容词形式。 重点词汇讲练 原句 The problem begins when we add huge quantities of extra carbon dioxide into the atmosphere. 当我们在大气层中增加了大量额外的二氧化碳时, 问题就来了。(B6 P26) 1. quantities of =a large quantity of 许多, 大量的 例句 Quantities of flood were pumped into the lake. 大量的洪水被抽进湖里。 注意 ⑴ a quantity of后既可接复数可数名词，也可接不可数名词。作主语时，如果后接不可数名词，谓语用单数形式; 如果后接复数可数名词，谓语常用复数形式。 ⑵ quantities of后既可接复数可数名词，也可接不可数名词，作主语时，谓语都用复数形式。 运用 用所给词的适当形式填空。 ⑴ A quantity of baskets _____ (be) on sale last night. ⑵ Quantities of polluted water ___ (be) flowing into the sea now. were are ⑶ A large quantity of beer ____ consumed, which caused the fact that quantities of crops _____ imported last year. (be) were was 原句 It means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up. (B6 P26) 2. go up (=rise)上升; 增长; 升起;兴建 例句 The price is going up. 价格在上升。 提示 go up没有被动语态, 可用进行时。 运用 根据中文意思完成下面句子。 ⑴ 物价又上涨了。 Prices ______________ again. ⑵ 到处在兴建新工厂。 New factories __________ everywhere. are going up have gone up 3. (原因) result in (结果)引起; 导致; 造成 (结果) result from (原因) 由于……而引起 原句 They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide. 他们还赞同下述观点, 正是由于越来越多燃烧化石燃料导致了二氧化碳的增加。(B6 P26) 例句 His carelessness resulted in the accident. 他的粗心大意导致了这起意外。 同义 bring about, lead to导致 运用 填入一个适当的词。 ⑴ Their dispute resulted ___ war. ⑵ His illn