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约1950字。

　　BOOK4       UNIT 2  课后练习
　　第一部分：英语知识运用
　　一：重点短语：
　　1. do one’s research: 2: struggled for:
　　3: make it possible to do sth. 4:graduate from
　　5:since then 6:search for
　　7:thanks to 8:rid…of
　　9: be satisfied with                          10: care about
　　11: would rather 12:spend sth on
　　13: dream for 14:awake from one’s dream
　　15: with the hope of 16:so that
　　17: become very common in 18:cause damage to
　　19:build up 20:lead to
　　21: turn to 22:focus on
　　23:keep… free from/of 24:prevent…from
　　二： 重点句子：
　　1. ___________, what did you do to grow them? __________, what kind of plant would you like to try growing? 如果是这样，你怎么来种植它们？ 如果不是， 你想尝试着种哪种植物？
　　2. What ____________________ would happen if tomorrow there was suddenly no rice to eat? 如果明天突然没有了稻米可吃，你认为会发生什么事？
　　3. In 1974, he became ___________ agricultural pioneer in the world to grow rice that has a high output. 在1974年，他成为世界上第一位种植高产水稻的农业先驱。 
　　4. _______________________, farmers are producing harvests ____________________. 用他的杂交水稻种子，农民们种出的粮食比以前多了一倍。
　　5. They often change the kind of crop in each field _________________, for example, growing corn or wheat and then the next year peas or soybeans. 他们通常每隔几年就换种农作物，比如在种玉米或小麦后的一年种豌豆或大豆。
　　6. Crops such as peas or soybeans put important minerals back into the oil, ______________ ready for crops such as wheat or corn that need rich and fertile soil. 像豌豆或大豆这样的农作物将重要的矿物质带回土壤，从而使之适宜于要求土壤肥沃的农作物，比如小麦或玉米。 
　　第二部分：阅读理解
　　阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项，并在答题卡上将该项涂黑。
　　A
　　Steve Jobs, the designer of Apple Computer, was not quite successful in his early years. He was not among the best students at school and from time to time he got into trouble with either his schoolmates or his teachers. But he was full of new ideas, which few people saw the value of. Things remained the same when he went up to college and he dropped out halfway.
　　Steve Jobs worked first as a video game designer at Atari. He worked there for only a few months and then he set out to tour India. He hoped that the trip would give him more ideas and give him a change in life for the better.
　　After he returned from India, he began to live on a farm in California. And then, in 1975, Steve Jobs set about making a new type of computer. Along with his friend Stephen Wo, he designed the Apple Computer in his bedroom and actually built it in his garage. He chose the name “Apple” because it reminded him of a happy summer he once spent on an orchard(果园) in Oregon.
　　His Apple Computer turned out to be such a great success that Steve Jobs soon became worldwide famous. But unluckily, he died of a serious illness in 2011.
　　1. Steve Jobs __________ when he was at school.
　　A. was one of the best students B. didn’t do very