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2. Do not be disappointed if you have to try several times before you finally stop smoking.
即使你非得经过多次戒烟才能最后把它戒掉，你也不要失望。
【语法总结】“it”的用法
1. it可指代前文提到的事物；替代前文中的内容；指代一位性别不明的小孩或未知的人；指代未指明但谈话双方都知道的那件事；指代时间、天气、气候、距离等自然现象。
2. it用作形式主语，不定式、动名词或主语从句做真正主语。
It worries me that he keeps changing his mind.
3. it作形式宾语，不定式、动名词或宾语从句做真正宾语。
He didn't make it clear when and where the meeting would be held. 4. 表示“喜欢、恨”等心理方面的动词，后面接it，然后再跟宾语从句，it代指从句所表达的内容。此类动词有hate，dislike，enjoy，appreciate等。
I'd appreciate it if you would like to teach me how to use the computer.
5. 强调句型：It is/was+被强调部分+ that(who)...
强调句型用来强调谓语动词/定语以外的任何句子成 分。当被强调部分是人时也可以用who。
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（1）强调句用于一般疑问句：Is/Was＋被强调部分＋that＋其他部分。 （2）强调句用于特殊疑问句：疑问词(被强调部分)＋is/was＋ it＋ that＋其他部分？
（3）在强调原因状语从句时，只能强调由because所引导的从句
例：It was because he was ill that he didn't come to school yesterday. （4）在强调not...until结构时必须把not与until一起放到被强调的位置上 例 It was not until she took off her dark glasses that I realized she was my brother.
（5）如何判断是否是强调句
可把 It，is / was和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 didn’t ask her to do the job. →Because she was ill, they didn’t ask her to do the job.
Unit4 Global warming
【重点词汇、短语】
come about 发生；造成 subscribe to 同意；订购 quantity n. 量；数量
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quantities of 大量的
tend vi. 趋向；易于；照顾 vt. 照顾；护理 go up 上升；增长；升起 result in 导致
oppose vt. 反对；反抗；与(某人)较量 opposed adj. 反对的；对立的 be opposed to 反对…… state vt. 陈述；说明 range n. 种类；范围 even if 即使 keep on 继续
glance vi. 看一下；扫视 n. 一瞥 steady adj. 平稳的；持续的；稳固的 steadily adv. 平稳地；持续地 tendency n. 倾向；趋势
widespread adj. 分布广的；普遍的 on the whold 大体上；基本上 average adj. 平均的
on behalf of 代表……一方；作为……的代言人 put up with 忍受；容忍 so long as 只要 an so on 等等
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circumstance n. 环境；情况
【重点句型】
1. All scientists subscribe to the view that the increase in the earth's temperature is due to the burning of fossil fuels like coal, natural gas and oil to produce energy.
所有的科学家同意这种观点：人们为了生产能量而燃烧化石燃料如煤、天然气和石油，从而引起了地球温度的升高。
2. It means that more heat energy tends to be trapped in the atmosphere causing the global temperature to go up.
这意味着更多的热量被困在大气层中，从而引起全球温度上升。
3. It was a scientist called Charles Keeling, who made accurate measurements of the amount of carbon dioxide in the atmosphere from 1957 to 1997.
是一位名叫查尔斯·基林的科学家曾经把1957-1997年期间大气层中二氧化碳的含量作了精确的统计。
4. They also agree that it is the burning of more and more fossil fuels that has resulted in this increase in carbon dioxide.
他们还同意下述观点，正是燃烧越来越多的化石燃料导致了二氧化碳的增加。 5. On the other hand, there are those, like George Hambley, who are opposed to this view, believe that we should not worry about high levels of carbon dioxide in the air.
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另一方面，还有一些人，像科学家乔治·汉布利，反对上面的观点，他们认为我们不必担心空气中会有高含量的二氧化碳。
【语法总结】“it”的用法（详见第三单元语法总结）
Unit5 The power of the nature
【重点词汇、短语】
alongside adv.在旁边；沿着边 prep. 在……旁边；沿着……的边 appoint vt. 任命；委派
wave n. 波浪；波涛 vi. 波动；起伏；挥手 absolute adj. 绝对的；完全的 absolutely adv. 绝对地；完全地
suit n. 一套外衣；套装 vt. 适合；使适宜 make one’s way 前往
potential n. 潜在性；可能性；潜能 adj. 可能的；潜在的 actual adj. 实在的；实际的 shoot (shot, shot) vt. 射中；射伤 anxious adj. 忧虑的；不安的 anxiety n. 担心；焦虑；渴望
panic (panicked, panicked) vi. & vt. 惊慌 n. 惊慌；恐慌 glance through 匆匆看一遍
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