[课本习题]人教版 必修四 Unit

【课本习题】人教版 必修四 Unit 2

作者：儒风无棣时间：2012年12月28日 00:06

Unit2课内练习答案（P11Ex.1）

Name: Yuan Longping Nationality: Chinese

Age: 82(as of 2012) Occupation: scientist/farmer

Education: graduated from Southwest Agricultural College in 1953

Dream: to export his hybrid rice so that it can be grown around the globe

Achievement: in 1974, developed hybrid rice which produces 1/3 more than normal rice Hobbies: listening to violin music, playing mah-jong, swimming and reading P11Ex.2

1. Even when was a young man, he knew how important it was to produce bigger rice crops.

2. During his early years, much of the countryside was troubled by hunger.

3. As they use his hybrid rice, farmers are producing twice as much rice as before.

4. He is not interested in buying things for himself or in having a comfortable life.

5. It does not cost anything to dream for something.

P11Ex.3

1. Dr Yuan wanted to increase the rice output because he saw many people go hungry when he was young.

2. I think he is more a scientist, although he works in the fields like a farmer. His main purpose is not to make a profit for himself but to study agriculture and use that knowledge to himself but to improve farming for farmers everywhere his goal is not to make money.

3. Because of his work with developing hybrid rice, it seems that Dr Yuan must be a very patient and careful man. He didn’t give up but kept working on his project. He also seems to be a very kind man, who cares for others. He wants to use his invention to help hungry people around the world.

4. I think Dr Yuan was successful because he kept working and didn’t give up. He was also very motivated to succeed and help other farmers around China.

5. I mostly agree. I think being rich man cause a lot of problems, but it really depends on the life and attitude of the person who is rich. People who are rich certainly have different problems from people who are not.

6. I think developing other hybrid grains would make a great difference in the problem of

world hunger. Hybrid grains that can survive in very dry or very hot areas would be very useful in Africa and other areas. Hybrid grains that cannot be easily killed by insects and diseases would useful around the world.

P12Ex.1

1sunburnt2rid ……of 3expand 4circulate 5 would rather 6 struggle 7 export 8 （be ）satisfied with 9equip 10crops 11thanks to

. P12Ex.2

1statistics, globe 2super, nationalities 3Hunger, disease 4Vietnam, occupations 5freedom,exported

P12Ex.3

decade, struggle, expanding, Equipped, output, grain, crops, battles, disturbing

P13Ex.2

1. Helping people in need of help is nice.

2. Growing super hybrid rice is not easy.

3. Learning more about farming is not difficult.

4. Doing research in the countryside is not as easy as in the city.

5. Getting rid of hunger is very important for some African countries.

6. Explaining this again is important or we will confuse the students.

P13Ex.3

1st group: to do

2nd group: doing

1st group: promise fail hope afford plan

2nd group: enjoy finish mind miss keep

3rd group: try stop begin forget like start

P13Ex.4

1. to see 2learning3having4to experiment 5 trying out 6 to find out 7 to develop 8 to fail 9 owning 10 sending

P14Ex.1

1. They are a great way to stop crop disease and increase production.

2. They can damage the land by killing helpful bacteria and pests and by staying in the ground and underground water for a long time. They damage people’s health by building up in their bodies and leading to cancer or other illnesses.

3. Organic farming means growing crops without using any chemicals.

4. The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or people’s health.

P15Ex.2

P15Ex.1(Listening)

The possible bad effects of chemical fertilizers on the fruit and vegetables that we eat today.

P15Ex.2

1T2F3T4F5T

Workbook 练习答案（P48Ex.1）

1、2、3、6

P48Ex.2

1B2A3B

P49Ex.1

confuse —confusion discover —discovery equip —equipment expand —expansion produce —production

battle —battle comment —comment export —export focus —focus regret —regret struggle —struggle sum —sum

1circulated 2focus, export 3commented, regret 4struggled, confusing 5equip

P49Ex.2

chemicals, pests, bacteria, production, soil, discoveries, chemicals, minerals, nutrition, root, focus

P49Ex.3

1. Today’s lesson focuses on how to write a summary of a news article.

2. We must skim the report to find the main idea.

3. The teacher told us to underline the difficult words and look them up in the dictionary.

4. He said that details like statistics should not be included.

5. I think I ’m going to use a report about how farmers are keeping their fields free of chemical fertilizers.

6. It took the farmer twenty years to build up his business.

7. Using too much chemical fertilizer will lead to serious problems.

P50Ex.1

1Smoking2paying3getting4Learning5playing6Doing7Using8dancing9exchanging10supply ing

P50Ex.2

to die to make fighting to encourage to manage to leave to spend / spending working ploughing turning to find working

P51Ex.2

1B Middle East 2A Egypt 3C North America 4D Central America

P53Ex1

1. He saw how some farms produced good crops and healthy animals and others did not.

2. He thought that when he found the best agricultural methods he would write them down so all farmers could read about them and benefit.

P53Ex.2

1----1 2---2 3---3 4---4 5---5 6---6 7---7