高中英语必修四第二单元重点.doc

Word 行业资料分享--可编辑版本--双击可删====高中英语必修四第二单元重点、难点Unit Two Working the land1、Indeed, his sunburnt face and arms and his slim, strong body are just like those of millions of Chinese farmers, for whom he has struggled for the past five decades.的确，他那被太阳晒得黝黑的脸庞和手臂，以 及他那瘦削而又结实的身体就跟过去五十年他一直在帮助的千百万的中国农民一样完成时态的时间表达：（1）for + 段时间 多长时间以来（2）before 以前（3）since + 时间点 自从什么时间since +时间段 +ago 自从多长时间以前 since +从句 自从… since then 从那以后 （4）recently ; lately; in recent +时间 最近；最近多长时间（5）so far; by far; up till now; by now 到现在为止（6）by the end of… / by the time… 到…时间结尾（7） in / during / for the past / last + 时间段 在过去的多长时间里特别提示：（1）如果句子中有以上时间，句子一般要用完成时。

2）before 后不能跟时间；否则句子用过去时态3）by the end of… / by the time…多用于过去完成时或将来完成时即时活用：1、________ several years he has been working like this. A. In B. After C. For D. Since2、The heavy rainfall has caused vegetable prices to rise daily ______ the last two months. A. by B. since C. for D. with3、–Where does Mr Zhang live? --- He has been on the island ________the end of the Long March. A. since B. by C. in D. at 4、I have been in London twice ______ 1965. A. in B.since C. during D. when答案：C C A B2、Dr. Yuan searched for a way to increase rice harvests without expanding the area of the fields.袁博士寻找一种在不扩大土地面积的情况下增加收成的办法。

search vt. 搜查 The guards searched the house carefully. 警卫仔细搜查了整个房子They searched the woods for the lost boy. 他们搜查整个森林寻找丢失的小孩联想扩展：（1）search for 寻找 What are you searching for? 你在找什么？（2）search one’s heart 扪心自问I often search my heart if I am a competent teacher. 我常扪心自问我是不是一个称职的老师3）in search of 寻找 We started at once in search of something to eat. 我们立刻开始寻找可 吃的东西3、Dr. Yuan searched for a way to increase rice harvests without expanding the area of the fields.袁博士寻找一种在不扩大土地面积的情况下增加收成的办法expand vi. & vt. 用法归纳：（1）膨胀；扩大 A tyre expands when you pump air into it. 给轮胎充气轮胎会鼓起来的。

Xi’an is expanding in all directions. 西安正在向四周扩大2）加大；使膨胀Heat expands metal. 热使金属膨胀He has expanded his business. 他把生意扩大了 源-于-网-络-收-集====Word 行业资料分享--可编辑版本--双击可删====联想扩展：expand on 细说；阐述Let me expand on my idea. 我来阐述一下我的观点4、Dr. Yuan is now circulating his knowledge in India, Vietnam and many other less developed countries to increase their harvest.袁博士正在把他的知识用在像印度、越南这些不发达的国家以便于增加它们水稻的 产量circulate vi. & vt.用法归纳：（1）循环；流通 Blood circulates in the body. 血液在体内循环It does good to a country’s economy if money circulates. 钱流动对国家经济有好处。

2）传播；流传Bad news circulates quickly. 坏消息传播的很快Some people like to circulate false news. 有些人喜欢传播 假消息联想扩展：circulation n. 循环；传播；发行量5、Thanks to his research, the UN has more tools in the battle to rid the world of hunger.多亏了他的研究，联合国在消除世界饥饿的战斗中又多了些方法thanks to 幸亏；多亏；由于Thanks to the illness, I didn’t take that flight. 多亏生病，我没乘坐那次航班Thanks to the teacher’s help, I’ve made some progress with my English.由于老师帮助，我的英语取得了一些 进步联想扩展：下列词组中的 to 为介词look forward to 期望 see to 处理；修理 be / get used to 习惯于 pay attention to 注意 get down to 开始 认真做 lead to 导致 devote…to 贡献 stick to 坚持；遵循 object to 反对 prefer doing… to 喜欢…胜过 于 get around to 找时间做… live up to 不辜负 refer to 指的是；适用于 belong to 属于 compare…to… 把…比作 turn to 转向；求助于 add to 增加 due to 由于；归功于 be addicted to 沉迷于 adapt to 适应 agree to 同意 be subject to 受…约束 owe to 归功于 thanks to 幸亏；由于 lose heart to 喜欢 tend to 倾向于 urge to 促使采取 take to 喜欢 be accustomed to 习惯于即时活用：I usually enjoy his film, but the latest one ____.A. didn’t come up to my expectation B. didn’t turn out beyond expectationC. didn’t live up to my hope D. doesn’t come up to our expectation 答案：C6、Using his hybrid rice, farmers are producing harvests twice as large as before.用他的杂交水稻种子，农民们种出的粮食比以前多了一倍。

倍数表达法(1) 倍数（百分数）+ 形容词比较级 + than + 比较对象 增加…倍This room is three times bigger than that one. 这个房子比那个房子大三倍2) 倍数+ as +形容词原形 + as + 比较对象 是…的几倍This room is three times as big as that one. 这个房子是那个房子的三倍3) 倍数 + up on +比较对象 增加…倍The number of students in our school now is 200% up on that of last year. 我们学校现在的学生数量比去年 增加了两倍4) 倍数 + over +比较对象 增加…倍The number of students in our school now is 200% over that of last year. 我们学校现在的学生数量比去年增 加了两倍5) 倍数 + the + 名词 + of +比较对象 是…的几倍源-于-网-络-收-集====Word 行业资料分享--可编辑版本--双击可删====This bridge is three times the length of that one. 这座桥的长度是那座桥的三倍。

即时活用：1、Some parts in South China have experienced______ this year as they did last year.A. twice as much rain B. rain twice as much C. as twice much rain D. twice rain as much2、My glasses cost me ______ the lost pair that I bought.A. times three B. three times more than C. three times as much as D. as much three times as3、– Do you regret paying fifty dollars for the dog? --- No, I would gladly have paid ____ for him.A. as much twice B. twice so much C. much twice D. twice as much4、Now the city is ______ it used to be.A. three times as large as B. three time larger as C. larger as three times as D. as three times larger than 答案：ACDA7、Thanks to his research, the UN 。