【课本习题】人教版 必修四 Unit 2.doc

【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: ChineseAge: 82(as of 2012) Occupation: scientist/farmerEducation: graduated from Southwest Agricultural College in 1953Dream: to export his hybrid rice so that it can be grown around the globeAchievement: in 1974, developed hybrid rice which produces 1/3 more than normal riceHobbies: listening to violin music, playing mah-jong, swimming and readingP11Ex.21. 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.31. 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 didnt 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 didnt 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.11sunburnt2ridof 3expand 4circulate 5 would rather 6 struggle 7 export 8 （be）satisfied with 9equip 10crops 11thanks to.P12Ex.21statistics, globe 2super, nationalities 3Hunger, disease 4Vietnam, occupations 5freedom,exportedP12Ex.3decade, struggle, expanding, Equipped, output, grain, crops, battles, disturbingP13Ex.21. 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.31st group: to do2nd group: doing1st group: promise fail hope afford plan 2nd group: enjoy finish mind miss keep3rd group: try stop begin forget like startP13Ex.41. to see 2learning3having4to experiment 5 trying out 6 to find out 7 to develop 8 to fail 9 owning 10 sendingP14Ex.11. 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 peoples 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 peoples health.P15Ex.2P15Ex.1(Listening)The possible bad effects of chemical fertilizers on the fruit and vegetables that we eat today.P15Ex.21T2F3T4F5TWorkbook练习答案（P48Ex.1）1、2、3、6P48Ex.21B2A3BP49Ex.1confuseconfusion discoverdiscovery equipequipment expandexpansion produceproduction battlebattle commentcomment exportexport focusfocus regretregret strugglestruggle sumsum1circulated 2focus, export 3commented, regret 4struggled, confusing 5equipP49Ex.2chemicals, pests, bacteria, production, soil, discoveries, chemicals, minerals, nutrition, root, focusP49Ex.31. Todays 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 Im 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.11Smoking2paying3getting4Learning5playing6Doing7Using8dancing9exchanging10supplyingP50Ex.2to die to make fighting to encourage to manage to leave to spend / spending working ploughing turning to find workingP51Ex.21B Middle East 2A Egypt 3C North America 4D Central America