（一)原因
1.Anumberoffactorsareaccountable forthissituation.
2.Theanswertothisprobleminvolvesmanyfactors.
3.Thephenomenonmainlystemsfromthefactthat...
4.Thefactorsthatcontributetothissituationinclude...
5.Thechangein...largelyresultsfromthefactthat...
6.Wemayblame...,buttherealcausesare...
7.partoftheexplanationsforitisthat...
8.oneofthemostcommonfactors(causes)isthat...
9.Anothercontributingfactor(cause)is...
10.perhapstheprimaryfactoristhat…
11.Butthefundamentalcauseisthat...
（二)比较
1.Theadvantagefaroutweighthedisadvantages.
2.TheadvantagesofAaremuchgreaterthanthoseofB.
3.AmaybepreferabletoB,butAsuffersfromthedisadvantagesthat...
4.Itisreasonabletomaintainthat...butitwouldbefoolishtoclaimthat...
5.Forallthedisadvantages,ithasitscompensatingadvantages.
6.Likeanythingelse,ithasitsfaults.
7.AandBhasseveralpointsincommon.
8.AbearssomeresemblancestoB.
9.However,thesameisnotapplicabletoB.
10.AandBdifferinseveralways.
11.Evidently,ithasbothnegativeandpositiveeffects.
12.peopleusedtothink...,butthingsaredifferentnow.
13.ThesameistrueofB.
14.WonderingasAis,ithasitsdrawbacks.
15.ItistruethatA...,butthechieffaults(obviousdefects)are...
二、常用短语1.kindsof各种各样的
2.either…or…或者……或者……，不是……就是……
3.neither…nor…既不……也不……
4.Chineseteawithout,anythinginit中国清茶
5.takeaseat就坐
6.homecooking家常做法
7.befamousfor因……而著名
8.ononeswayto在……途中
9.besick/illinhospital生病住院
10.attheendof在……的尽头，在……的末尾
11.waitfor等待
12.intime及时
13.makeone’swayto…往……（艰难地）走去
14.justthen正在那时
15.firstofall首先，第一
16.gowrong走错路
17.be/getlost迷路
18.makeanoise吵闹，喧哗
19.geton上车
20.getoff下车
21.standinline站队
22.waitingroom候诊室，候车室
23.attheheadof……在……的前头
24.laughat嘲笑
25.throwabout乱丢，抛散
26.infact实际上
27.atmidnight在半夜
28.haveagoodtime=enjoyoneself玩得愉快
29.quarrelwithsb.和某人吵架
30.takeone’stemperature给某人体温
31.have/getapainin…某处疼痛
32.haveaheadache头痛
33.assoonas…一……就……
34.feellikedoingsth.想要干某事
35.stop…fromdoingsth.阻止……干某事
36.fallasleep入睡
37.againandagain再三地，反复地
38.wakeup醒来，叫醒
39.insteadof代替
40.lookover检查
41.takeexercise运动
42.hadbetter(not)dosth.最好（不要）干某事
43.attheweekend在周末
44.ontime按时
45.outof从……向外
46.allbyoneself独立，单独
47.lotsof=alotof许多
48.nolonger/more=not…anylonger/more不再
49.getback回来，取回
50.soonerorlater迟早
51.runaway逃跑
52.eatup吃光，吃完
53.runafter追赶
54.takesth.withsb.某人随身带着某物
55.take(good)careof…=lookafter…(well)（好好）照顾，照料
56.thinkof考虑到，想起
57.keepadiary坚持写日记
58.leaveonebyoneself把某人单独留下
59.harderandharder越来越厉害
60.turnon打开（电灯、收音机、煤气等）
61.turnoff关
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