高中英语必修四第二单元重点

高中英语必修四第二单元重点、难点Unit Two Working the land

1、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 en d 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. Since

2、The heavy rainfall has caused vegetable prices to rise daily ______ the last two months. A. by B. since C. for D. with

3、–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 B

2、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。

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 ill ness, 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pr efer 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 expectation

C. didn’t live up to my hope

D. doesn’t come up to our expectation 答案：C

6、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

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 much

2、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 as

3、– 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 much

4、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：ACDA

7、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。

rid v. 免除,清除,使...获自由Let's get rid of this moldy old furniture. 咱们把这件发霉的家具扔了。

We will be glad to get rid of him. 我们很高兴摆脱了他。

联想扩展：

（1）be rid of 摆脱掉

She was glad to be rid of him. 摆脱了他她很高兴。Will I ever be rid of this cold? 我的感冒还能好吗？

（2）get rid of 摆脱掉；戒掉

It took me a month to get rid of my cough. 我的咳嗽一个月后才好。You should get rid of smoking. 你应该戒烟。