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Unit 2 Working the land 第2单元 耕作土地(重点句型)--人教版新课标必修四第一单元学案

unit 2 working the land  第2单元 耕作土地(重点句型)

1. in 1974, he became the first agricultural pioneer in the world to grow rice that has a high output. 1974年,他成为世界上第一位种植高产水稻的农业先锋。

不定式放在表示次序的词the first, the last, the best以及the only, the very, the right等词后面, 且这些词与动词不定式有逻辑上的主谓关系,结构为:the first/last/best/only/very/right ...+n. + to do sth.表示“第一个/最后一个/最好的一个/唯一的/恰好的/合适的……做某事的人/物”。

he is always the first to come and the last to leave. 他总是第一个来并且最后一个离开。

the last man to leave the sinking ship was the captain.最后一个离开正在下沉的船的那个人是船长。

单项填空

he is the last person         to mary’s birthday party.

a. to invite b. to be invited c. invited d. being invited

解析:选b。考查不定式作定语的用法。当名词前面有序数词或last, next等词修饰时,名词后面多用不定式作定语。如new zealand was the first nation in modern times to allow women to vote. 新西兰成为现代史上第一个允许妇女有选举权的国家。

2. 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

a+be+倍数+as+adj.+as+b

a+be+倍数+比较级+than+b

a+be+倍数+(由某些形容词变化而来的)n.+of+b

i’m not going out with a man who’s twice as old as me. 我不愿意和一个年纪比我大一倍的男人一起参加社交活动。

we got three times as many people as expected. 来的人超过我们预料人数的两倍。

you’re not half as clever as you think you are.你可不像自己想像的一半那么聪明。

单项填空

what a table! i’ve never seen such a thing before. it is         it is long.
a. half not as wide as b. wide not as half as
c. not half as wide as d. as wide as not half

解析:选c。考查倍数表达法。表达倍数的结构应该是:a+ be+倍数+as+ adj.+ as +b。as... as中间是形容词或副词的原级,而不可以是比较级或最高级。

3. this also keeps the air, soil, water and crops free from chemicals. 这还可以让空气、土壤、水以及农作物不受化学物质的污染。

keep ...free from 无……的;免于……;摆脱……(常用作表语、后置定语或补语)

联想拓展

be free to do sth. 自由地做,随意地做

set sb. free 释放某人

get/give sth. for free免费得到/赠送

a smokeˉfree room/area无烟室/区

free of charge免费

完成句子

用这个东西把桌子罩住,免得有灰尘落在上面。
         the table         dirty by putting a cover over it.

答案:keep; free from

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