假如你是杨立，你的美国好友吉姆(Jim) 来信询问你对未来生活的畅想。请你根据下面的内容提示，发挥想象，给吉姆写一封回信。
提示：1.your job；
2．your home；
3．your free time activities；
第一课时Section A(1a～2d)
Ⅰ.1.prediction 2.environment 3.parts 4.earth 5.planets
Ⅱ.6.crowded7.plants8.pollution9.paper10.teach
Ⅲ.11－15CCBAB
Ⅳ.16.in great danger17.live to be18.play a part19.move to
20．There will be
Ⅴ.21－25FCAGD
第二课时Section A(3a～3c)
Ⅰ.1.sea 2.sky 3.peace 4.built 5.spends
Ⅱ.6.few7.little8.fewer9.less10.more
Ⅲ.11－15BCBAC
Ⅳ.16.What will17.Will you18.don't think；will19.will be20.How long will
Ⅴ.21.write22.be23.part24.bluer25.with26.working27.again28.able 29.space30.impossible
第三课时Section B(1a～1e)
Ⅰ.1.apartment 2.space 3.astronauts 4.kidding 5.rockets
Ⅱ.6.plays7.is watching8.bought9.will work10.will have；will be；won't be Ⅲ.11－15ACDAD
Ⅳ.16.lived with17.on the space station18.will fly；to19.took the train
20．computer programmers
Ⅴ.21.Because she thinks it is relaxing.22.Once a week.23.He is an engineer.
24.She thinks she will be a violinist.25.In Europe.
第四课时Section B(2a～2e)
Ⅰ.1.words 2.sides 3.holiday 4.disagree 5.already
Ⅱ.6.possible7.shapes8.factories9.dangerous10.believes
Ⅲ.11－15CACCB
Ⅳ.16.not be able to17.at some point18.fall down19.over and over again 20.There are；swimming
Ⅴ.21.play22.never23.humans24.either25.work26.inside27.becoming 28.future29.even30.than
单元重难点题组训练
一、Ⅰ.1－4ACDB
Ⅱ.5.yet 6.still7.already8.already
二、Ⅰ.1－4CABC
Ⅱ.5.agree that 6.agree with7.agreed to take
三、1.fell asleep 2.fell ill 3.fell off 4.fell down 5.fall behind
四、Ⅰ.1－3DAD
Ⅱ.4.There are；waiting for 5.There is；walking 6.Are there；taking
单元写作小专题&Section B(3a～4)