22. A. prefers B. devotes C. contributes D. addicts
21. A. coincidence B. challenge C. difficulty D. puzzle
3. [原句]Born into a poor farmer’s family in 1930, Dr Yuan graduated from Southwest Agricultural College in 1953. 1930年出生于一个贫穷的农民家庭，，袁博士于1953年毕业于西南农业大学。
[模仿要点] 句子结构： 过去分词作状语，+ 主句
[模仿1]配备了电子词典，学生觉得学习英语更容易和更方便了。
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答案：Equipped with electronic dictionaries, students find learning English much easier and more
convenient.
[模仿2]位于城市的中心地带，这座公园给市民带来很多享受。
答案：Located in the centre of the city, the park provides much enjoyment to the citizens.
2．[原句]Dr Yuan Longping grows what is called super hybrid rice.袁隆平博士种植被称之为高产量的杂交水稻。
[模仿要点] 句子结构：主句+what/whatever 引导的宾语从句
[模仿1]学生喜欢生活中如何新的东西。
答案：Students enjoy whatever is new in their life.
[模仿2]通过考试，学生可以了解他们的弱点从而更加努力学习。
答案：Through exams, students will learn what their weak points are and then study even harder.
2. This special strain of rice makes it possible to produce one-third more of the crop in the same fields. 这种特殊的稻种使得同样的田地多收获三分之一的产量。
[解释] make it + 宾语补足语 + 动词不定式, it 做形式宾语,动词不定式是真正的宾语，有时
真正的宾语是从句。常和动词consider/think/make/find/believe/declare/feel/guess/imagine/prove
等连用。如：He felt it his duty to take good care of them. 他感觉到好好照顾他们是他的责任。
再如：
1). The bad weather makes it impossible for us to go for a picnic.
2). We make it a rule to do some English practice before class.
3). Tom found it very embarrassing to be reminded of the long-standing debt.
4). Do you find it funny to see someone sliding on a banana skin?
[练习] 翻译句子。
1). 我们觉得支持好的领导是我们的职责。
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2). 我记得我想你讲清楚我不会来的。
Keys: 1). We consider it our duty to support good leaders.
2). I remember I made it clear to you that I was not coming.
1. In 1974, he became the first agricultural pioneer in the world to grow rice that has a high output. 1974年，他成了世界上第一位种植高产水稻的农业先锋。
[解释] 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/right/only/very/... + n. + to do sth.第一个/最后一个/最好的一个/合适的/唯一的/恰好的……做某事的人/物，如：
1). He is always the first (student) to come and the last to leave. 他总是第一个来和最后一个离开的(学生)。
2). The last man to leave the sinking ship was the captain. 最后一个离开正在下沉的船的是船长。
[练习] 根据句子意思填空。
1). I think he is the right person ________ (tell) her about this.
2). I’ d be the first ________ (admit) I might be wrong.
Keys: 1). to tell 2). to admit
7. keep...free from/of = protect sb./sth. from... 使……免受(影响/伤害)；使……不含(有害物)
[典例]
1). We should keep ourselves free from drugs. 我们应该远离毒品。
2). I hope you will keep yourself free from tobacco and alcohol. 我希望你不抽烟不喝酒。
1). We’ ve managed to ________ the garden ________ ________weeds this year.
2). Relaxation exercises can ________ your body ________ ________ tension.
Keys: 1). keep; free of 2). keep; free of
VI 重点句子 (旨在提供句子结构等所需材料)
6. lead to 导致；造成(后果)；通往
1). This misprint led to great confusion. 这个印刷错误造成很大的混淆。
2). His actions could lead to him losing his job. 他的行为有可能会导致他丢了工作。
[短语归纳] lead短语：
lead sb. to 把某人带到 lead sb. to do sth. 导致某人做某事
lead sb. in doing sth. 领导/带领某人做某事 lead to sb. doing sth. 导致某人做某事
[练习] 根据句子意思填空或按要求填空。
1). The events ________ ________ the start of the First World War.
2). What led him ________ (kill) his wife?
3). He had led everyone ________ (believe) that his family was very wealthy.
4). Our research led us ________ (介词) the conclusion that the present system is unfair.
5). Too much work and too little rest often _______ _______ illness.
6). He will lead the party of scientists ________ (do) the research.
7). Failure often lies in laziness while hard work _ ________ success.
8). The driver’ s carelessness ________ ________ the serious traffic accident.
Keys: 1). led to 2). to kill 3). to believe 4). to 5). leads to 6). in doing
7). leads to 8). led to / resulted in