1、因式分解因式分解主要方法主要方法:(1)提取公因式法提取公因式法 (2)公式法公式法:a2b2=(a+b)(ab)a22ab+b2=(ab)2请选择:请选择:若若AB=0则(则()(A)A=0;(B)B=0;(C)A=0且且B=0;(;(D)A=0或或B=0D解方程解方程 4x4x2 2=9=9解:移项,得解:移项,得0492x利用平方差公式分解因式,得利用平方差公式分解因式,得0)23)(23(xx可得可得.023023xx或.23,2321xx所以,原方程的根是所以,原方程的根是像上面这种利用因式分解解一元二次方程的像上面这种利用因式分解解一元二次方程的方法叫做方法叫做因式分解法因式分解法
2、。它的基本步骤是:。它的基本步骤是:(1)若方程的右边不是零,则先移项,使若方程的右边不是零,则先移项,使方程的右边为零;方程的右边为零;(2)将方程的左边分解因式;将方程的左边分解因式;(3)根据若根据若AB=0,则则A=0或或B=0,将解一将解一元二次方程转化为解两个一元一次方元二次方程转化为解两个一元一次方程。程。填空填空:(1)方程)方程x2+x=0的根是的根是 ;(2)x225=0的根是的根是 。X1=0,x2=-1X1=5,x2=-5例例1 解下列一元二次方程:解下列一元二次方程:(1)()(x5)(3x2)=10;解解:化简方程,得化简方程,得 3x217x=0.将方程的左边分解
3、因式,将方程的左边分解因式,得得 x(3x17)=0,x=0,或或3x17=0解得解得 x1=0,x2=317例例1 解下列一元二次方程:解下列一元二次方程:(2)(3x4)2=(4x3)2.解解:移项,得移项,得 (3x-4)2-(4x-3)2=0.将方程的左边分解因式,得将方程的左边分解因式,得(3x-4)+(4x-3)(3x-4)-(4x-3)=0,即即 (7x-7)(-x-1)=0.7x-7=0,或或 -x-1=0.x1=1,x2=-1 能用因式分解法解一元二次方程遇到类能用因式分解法解一元二次方程遇到类似例似例2这样的,移项后能直接因式分解这样的,移项后能直接因式分解就直接因式分解,
4、否则移项后先化成一就直接因式分解,否则移项后先化成一般式再因式分解般式再因式分解.用因式分解法解下列方程:用因式分解法解下列方程:(1)4x2=12x;(2)(x-2)(2x-3)=6;(3)x2+9=-6x;(4)9x2=(x-1)20 09 94 4x x2 2(5)例例2 解方程解方程x2=22x2 解解 移项,得 x2 22x+2=0,即 x2 2 2x+(2)2=0.(x 2)2=0,x1=x2=21.解方程解方程 x223x=-32.若一个数的平方等于这个数本身若一个数的平方等于这个数本身,你能求出这个数吗你能求出这个数吗(要求列出一要求列出一元二次方程求解元二次方程求解)?注意:
5、当方程的一边为注意:当方程的一边为0 0时,另一边容易分时,另一边容易分解成两个一次因式的积时,则用因式分解解成两个一次因式的积时,则用因式分解法解方程比较方便法解方程比较方便.因式分解法解一元二次方程因式分解法解一元二次方程的基本步骤的基本步骤Module 10Units 12Building the future People on the move重点单词重点单词1claim v主张;宣称;夺去生命主张;宣称;夺去生命 n要求,主张要求,主张 【用法拓展用法拓展】claim to have done 声称曾经做过某事声称曾经做过某事 make a claim 提出主张或要求提出主张或要求
6、 give up a claim 放弃要求放弃要求 have a claim on sb.to do 要求某人做某事要求某人做某事 Every citizen may claim the protection of the law.所有公民都有权要求得到法律的保护。所有公民都有权要求得到法律的保护。The tornado claimed dozens of lives.那场龙卷风夺去了几十条人命那场龙卷风夺去了几十条人命.After her house was burgled,she made a claim on her insurance.她家被盗后,她要求按保单赔付。她家被盗后,她要求按
7、保单赔付。剑桥高阶剑桥高阶即学即用即学即用完成句子完成句子The earthquake _ _ _ _(夺走夺走 了数以万计人的生命了数以万计人的生命)in Haiti in 2010.答案答案:claimed thousands of livesAfter her car collided with a bus,she _ _ _ _(向向索赔索赔)her insurance.答案答案:made a claim on2target vt.把把作为目标作为目标 n靶子,目标靶子,目标 【用法拓展用法拓展】target sb./sth.把把作为目标作为目标 target sth.on/at sb
8、./sth.目的在于目的在于 hit a target 完成指标完成指标 set a target for sth.为为制定目标制定目标 meet a target 达到目标达到目标 on target 按目标按目标 an easy target 容易击中的目标;容易受攻击的人容易击中的目标;容易受攻击的人 Our bombers went out today to target the enemys airport.我军轰炸机今天出击,以敌人的机场作为轰炸目标。我军轰炸机今天出击,以敌人的机场作为轰炸目标。The paper is targeted specifically at young
9、 people.这份报纸是专门面向年轻人的。这份报纸是专门面向年轻人的。剑桥高阶剑桥高阶 The governments target of 3.5%annual growth seems easily attainable.政府制定的政府制定的3.5%的年增长目标似乎很容易实现。的年增长目标似乎很容易实现。剑桥高阶剑桥高阶即学即用即学即用完成句子完成句子What type of reader is the new magazine _(把把 作为目标作为目标)?答案答案:targetingThis book will be _ _(对象对象)of bitter criticism.答案答案:
10、the targetThis program _ _ _(目的在于目的在于)improving the health of women of all ages.答案答案:is targeted at3doubt n怀疑,疑惑,疑问怀疑,疑惑,疑问 v怀疑,不信怀疑,不信 【用法拓展用法拓展】without doubt 无疑地,必定地无疑地,必定地 no doubt 确实地,必定地确实地,必定地 beyond/out of doubt 毫无疑问地,确实地毫无疑问地,确实地 in doubt 不肯定,不确定不肯定,不确定 doubt about/as to sth.关于关于的怀疑的怀疑 The o
11、utcome of the election remains in doubt.选举的结果仍然不能肯定。选举的结果仍然不能肯定。There is no doubt about his innocence.他完全是无辜的。他完全是无辜的。She is without(a)doubt the best student I have ever taught.毫无疑问,她是我教过的最优秀的学生。毫无疑问,她是我教过的最优秀的学生。剑桥高阶剑桥高阶 【温馨提示温馨提示】doubt用于肯定句时,从句用用于肯定句时,从句用whether和和if引导。引导。doubt用于否定句和疑问句时,从句常用用于否定句和
12、疑问句时,从句常用that引导。引导。They doubted whether the meeting will be put off.他们怀疑会议是否会被推迟。他们怀疑会议是否会被推迟。I dont doubt that you are honest.我不怀疑你是诚实的。我不怀疑你是诚实的。Nobody can possibly doubt what he says.没人会怀疑他说的话。没人会怀疑他说的话。即学即用即学即用完成句子完成句子If you _ _ _(有疑问有疑问)about the trip,you can ask your tour guide.答案答案:have some
13、doubts单项选择单项选择It is _ that people pay more and more attention to their health.Asure Buncertain Cwithout doubt Ddoubtful 答案答案:CI dont doubt _ he will come to my party tonight.Awhether Bif Cthat Dwhen 答案答案:C4.switch v转换,转变转换,转变 n开关开关 【用法拓展用法拓展】switch on 接通接通(电源电源)switch off 关闭关闭(电源电源)switch.to.把把转换成转换
14、成 Im going to switch my job soon.我很快要跳槽了。我很快要跳槽了。Ill switch your telephone number over to Mr.Clark.我将您的电话转给克拉克先生。我将您的电话转给克拉克先生。After the bank robbery,the gang switched cars(left one car and got into another)抢劫银行后,匪徒们换了汽车。抢劫银行后,匪徒们换了汽车。剑桥高阶剑桥高阶 Please switch the radio off because Im going to bed.请关掉收
15、音机,因为我要睡觉了。请关掉收音机,因为我要睡觉了。即学即用即学即用They switched the talk _ a more interesting subject.Aoff Bdown Cto Don 答案答案:C5handy adj.手边的,近便的;有用的;易使用的;手巧的手边的,近便的;有用的;易使用的;手巧的 【用法拓展用法拓展】be handy with 擅长擅长 be handy to do sth.方便做方便做 be handy for 离离很近,便于很近,便于 come in handy 派上用场派上用场 handily adv.敏捷地,便利地敏捷地,便利地 Firstt
16、ime visitors to France will find this guide particularly handy.初次来法国的游览者会发现这本旅游指南很有用。初次来法国的游览者会发现这本旅游指南很有用。剑桥高阶剑桥高阶 Its a nice house and its handy for(near)the station.这座房子很漂亮,离车站也很近。这座房子很漂亮,离车站也很近。剑桥高阶剑桥高阶 Dont throw those bottles awaytheyll come in handy (be useful)for the picnic next Sunday.别把那些瓶
17、子扔掉别把那些瓶子扔掉下周日出去野餐会派上用场。下周日出去野餐会派上用场。剑桥高阶剑桥高阶即学即用即学即用完成句子完成句子Dont throw that awayit might _ _ _.别把它扔掉,它或许有用。别把它扔掉,它或许有用。答案答案:come in handyIts always _ _ _ a couple of spare batteries.有两三块多余的电池总是很方便。有两三块多余的电池总是很方便。答案答案:handy to haveThe house is _ located near the park.这栋房子离公园很近。这栋房子离公园很近。答案答案:handily
18、 6.head 【用法拓展用法拓展】(1)vi.朝朝行进,常与行进,常与for,towards,across连用连用 (2)vt.负责,主管;位于负责,主管;位于首位,在首位,在当中名列第一;位于当中名列第一;位于 队伍之首,带领队伍之首,带领 (3)n.头脑,智力头脑,智力 keep ones head 保持头脑冷静保持头脑冷静 be out of ones head 发疯,精神错乱发疯,精神错乱 lose ones head 慌神,失去自制慌神,失去自制 use ones head 认真思考,动脑筋认真思考,动脑筋 The ship was heading for Shanghai.船正开
19、往上海。船正开往上海。Its about time that we were heading home.我们该动身回家了。我们该动身回家了。A delegation headed by former President George Bush are visiting China now.一个以前总统乔治一个以前总统乔治布什为首的代表团正在中国访问。布什为首的代表团正在中国访问。The movie heads the list of Oscar nominations.这部影片在奥斯卡提名影片中名列首位。这部影片在奥斯卡提名影片中名列首位。During an emergency,its imp
20、ortant to keep your head.紧急情况下保持镇定很重要。紧急情况下保持镇定很重要。美国传统美国传统He tends to lose his head in a crisis.他在危急关头容易惊慌失措。他在危急关头容易惊慌失措。美国传统美国传统If you believe his story,youre out of your head!如果你相信他的故事,你就是发疯了!如果你相信他的故事,你就是发疯了!美国传统美国传统即学即用即学即用完成句子完成句子In the early morning,we headed _ the destination.答案答案:for7excha
21、nge vt.交换,调换交换,调换 n交换,互换;兑换交换,互换;兑换 【用法拓展用法拓展】exchange angry words 争吵争吵 exchange A for B 拿拿A与与B交换交换 exchange sth.with sb.同某人交换某物同某人交换某物 in exchange for 以以作为交换作为交换 exchange information/ideas 交流信息交流信息/想法想法 exchange rate 兑换率,汇率兑换率,汇率 I exchanged my pesos for dollars.我把比索兑换成美元。我把比索兑换成美元。美国传统美国传统 I excha
22、nged the tie for a belt at the store.我在商店里把领带换成皮带。我在商店里把领带换成皮带。美国传统美国传统 The watch seemed a fair exchange for the compass.这块手表换那个指南针似乎还算公平。这块手表换那个指南针似乎还算公平。美国传统美国传统即学即用即学即用将句子补充完整将句子补充完整This book is broken.Can I _ _ _ _ _?这本书坏了,我可以换另一本吗?这本书坏了,我可以换另一本吗?答案答案:exchange it for another oneThey _ _ _ before
23、 the meeting but were finally persuaded to agree.他们在会议前吵起来了,但经过劝说言归于好。他们在会议前吵起来了,但经过劝说言归于好。答案答案:exchanged angry wordsHes giving her French lessons _ _ _ her teaching him English.他给她上法语课,作为交换,她给他上英语课。他给她上法语课,作为交换,她给他上英语课。答案答案:in exchange for8submit vi.&vt.服从,屈服;提出,提交;提议,主张,建议服从,屈服;提出,提交;提议,主张,建议 【用法拓
24、展用法拓展】submit to 服从服从 submit oneself to 自愿服从自愿服从 submissive adj.顺从的,驯服的,听话的顺从的,驯服的,听话的 submission n屈服,投降屈服,投降 beat/force sb.into submission 强迫某人顺从强迫某人顺从 He was too proud to submit to such treatment.他的自尊心太强,不甘于这样的对待。他的自尊心太强,不甘于这样的对待。They submitted themselves to his judgment.他们服从他的判决。他们服从他的判决。美国传统美国传统
25、I submit that the terms of the contract are unreasonable.我认为合同中的条款不合理。我认为合同中的条款不合理。美国传统美国传统即学即用即学即用完成句子完成句子All applications for jobs _ _ _ by Sunday.所有的求职申请必须在周日前上交。所有的求职申请必须在周日前上交。答案答案:must be submittedHe refused to cheat,but he finally _ _ _ _ _ _.他拒绝偷窃,但是最终被迫屈服了。他拒绝偷窃,但是最终被迫屈服了。答案答案:was forced to
26、 submit to it重点短语重点短语1put pressure on 给给施加压力施加压力 【用法拓展用法拓展】exert pressure on sb.to do sth.迫使迫使做做 relieve/reduce pressure on sb.缓解缓解的压力的压力 under pressure 在压力之下在压力之下 give in to pressure 屈从压力屈从压力 Were trying to put pressure on the government to change the law.我们试图对政府施加压力使其改变这一法令。我们试图对政府施加压力使其改变这一法令。She
27、s got a lot of pressure on her at work just now.她现在工作压力很大。她现在工作压力很大。剑桥高阶剑桥高阶 Can you work well under pressure?你在压力下能干得很出色吗?你在压力下能干得很出色吗?剑桥高阶剑桥高阶即学即用即学即用The pressure that the bank has _ on our company is to reduce its borrowing.Amade Bgiven Csent Dput 答案答案:DSome people work well _ while others get ne
28、rvous and do badly.Aunder way Bunder control Cunder pressure Dunder repairs 答案答案:C2on top of 除此之外,而且除此之外,而且 【用法拓展用法拓展】on the top of 在在上面上面 on top 在上面,在顶部在上面,在顶部 on top of the world 非常幸福地非常幸福地 from top to toe/bottom 从头到脚从头到脚 at the top of ones voice 大声地,高声地大声地,高声地 I have no time to go to the zoo.On t
29、op of that,Im not interested in animals.我没时间去动物园,此外,我对动物也不感兴趣。我没时间去动物园,此外,我对动物也不感兴趣。She was feeling on top of the world.她感到自己是世界上最幸福的人。她感到自己是世界上最幸福的人。剑桥高阶剑桥高阶 They cleaned the house from top to bottom.他们彻底打扫了房子。他们彻底打扫了房子。剑桥高阶剑桥高阶即学即用即学即用_ borrowing money,he also asked me to lend him the car.ABeside
30、BExcept for COn the top of DApart from答案答案:DPut the _ of your tongue against your upper teeth when you pronounce the sound.Atip Btop Cpeak Dpole答案答案:A21223at risk 处在危险状态,处境危险处在危险状态,处境危险 【用法拓展用法拓展】at the risk of sth.冒着做某事的风险冒着做某事的风险 take/run the risk of doing sth.冒着做某事的风险冒着做某事的风险 at all risks 冒一切风险冒一
31、切风险 risk sth./doing sth.冒险做冒险做 The whole future of the company is at risk.这家公司的整个前途都处在危险之中。这家公司的整个前途都处在危险之中。If you go out without a raincoat,you risk getting wet because it may rain.如果你不带雨衣出去如果你不带雨衣出去,你就要冒被淋湿的危险你就要冒被淋湿的危险,因为可能会下雨因为可能会下雨.At the risk of seeming rude,Im afraid I have to leave now.恕我失礼,
32、恐怕我现在必须得走了。恕我失礼,恐怕我现在必须得走了。剑桥高阶剑桥高阶 If you tell him the truth,you run the risk of hurting his feelings.你要是告诉他真相就太冒险了你要是告诉他真相就太冒险了,可能会伤害他的感情可能会伤害他的感情.剑桥高阶剑桥高阶【温馨提示温馨提示】at risk与与in danger同义,表示同义,表示“处在危险中处在危险中”,at the risk of与与in danger of同义,表示同义,表示“处在处在的危险状态的危险状态”。即学即用即学即用完成句子完成句子Since you knew the th
33、reat,why did you risk _(go)there alone?答案答案:going234show off 展示,炫耀展示,炫耀 【用法拓展用法拓展】show forth公布于众,发表,宣布公布于众,发表,宣布 show in 领进领进(客人等客人等)show itself呈现,露出呈现,露出 show of hands举手举手(表决表决)show out送出送出(客人客人)show sb.over领某人领某人(到处到处)参观参观 show sb.round领某人领某人(到处到处)参观参观 show up到席,露面;显眼;暴露;揭发到席,露面;显眼;暴露;揭发 She likes
34、 to show off her nice figure by wearing tight dresses.她喜欢穿紧身衣来炫耀她的好身材。她喜欢穿紧身衣来炫耀她的好身材。If youd like to come this way,Ill show you out.请往这边走,我送您出去。请往这边走,我送您出去。剑桥高阶剑桥高阶 After lunch the VIPs will be shown over the new Arts Centre.午餐后,将会带贵宾们参观新艺术中心。午餐后,将会带贵宾们参观新艺术中心。剑桥高阶剑桥高阶即学即用即学即用He was really a liar,b
35、ut surprisingly,no one dares to _.Ashow him off Bshow him out Cshow him up Dshow him around答案答案:C 245put into practice 将将付诸实践付诸实践 【用法拓展用法拓展】put down 放下;写下;镇压放下;写下;镇压 put off 推迟推迟 put on 穿上;上演;假装;增加穿上;上演;假装;增加 put up 搭建;张贴搭建;张贴 put up with 忍受忍受 put out 扑灭扑灭 put away/aside 收拾;储蓄收拾;储蓄 put forward 提出提出
36、Only in this way may it be put into practice fully and effectively.只有用这种方法才能全面有效地落实到位。只有用这种方法才能全面有效地落实到位。Police used tear gas to put the riot down.警察使用了催泪瓦斯来平定暴乱。警察使用了催泪瓦斯来平定暴乱。剑桥高阶剑桥高阶 I cant put off going to the dentist any longer.我不能再拖着不去看牙医了。我不能再拖着不去看牙医了。剑桥高阶剑桥高阶即学即用即学即用Many suggestions have bee
37、n _,but a decision is unlikely until after next years general election.Aput away Bput up with Cput forward Dput down答案答案:C 256look at 思考,考虑;查看,研究思考,考虑;查看,研究 【用法拓展用法拓展】look after 照顾照顾 look around/about 四处看看,环顾四周四处看看,环顾四周 look forward to 盼望,期待盼望,期待 look on 旁观,观望旁观,观望 look on.as 把把当作当作来看待来看待 look out f
38、or 小心小心 look through 浏览,翻阅浏览,翻阅 look down on/upon 轻视,看不起轻视,看不起 look into 调查调查 look up 查找查找 If I had had children,I might have looked at things differently.如果我有孩子,也许我考虑问题的角度就不同了。如果我有孩子,也许我考虑问题的角度就不同了。I asked the engineer to look at my car because I did not like the noises it was making.我请这位工程师帮我检查一下车
39、我请这位工程师帮我检查一下车,因为我不喜欢车子发出的噪音因为我不喜欢车子发出的噪音.Ive lived there so long I look on the town as my home.我在那个小镇住了很长时间,已经把那里当成我的家了。我在那个小镇住了很长时间,已经把那里当成我的家了。剑剑 桥高阶桥高阶即学即用即学即用用适当的介词或副词填空用适当的介词或副词填空The boy is old enough to look _ himself.答案答案:afterHe spent two weeks in Shanghai,looking _ the city.答案答案:around/abo
40、utWe are looking _ _ hearing from you soon.答案答案:forward toThey all looked _ him _ a member of their family.答案答案:on;asLook _!There is danger ahead.答案答案:out2627282930I shall look _ that I dont trust him again.答案答案:outA fox came to the tree and looked _ at the cock.答案答案:upHe looked _ his notes before w
41、riting the report.答案答案:throughLook _ these photographs and try to pick out the man you see.答案答案:throughI must look _ the time of your train.答案答案:up31323334357.on the move 在旅途中,在迁徙中在旅途中,在迁徙中 【用法拓展用法拓展】make the first move 首先采取行动首先采取行动 make a move 移动;动身,出发移动;动身,出发 get a move on 赶快,快点赶快,快点 The taxi driv
42、er was on the move all day.出租车司机整天开着车东奔西跑。出租车司机整天开着车东奔西跑。美国传统美国传统 We had better get a move on or well be late.我们最好赶快走,否则会迟到的。我们最好赶快走,否则会迟到的。美国传统美国传统 Neither side seems prepared to make the first move towards reaching a peace agreement.双方似乎都没有准备首先采取行动达成和平协议。双方似乎都没有准备首先采取行动达成和平协议。即学即用即学即用完成句子完成句子Its l
43、ateI think its time we _ _ _.(动身动身)答案答案:made a moveIt is reported that a group of rare deer is _ _ _(在迁徙中在迁徙中)and coming this way.答案答案:on the moveWe need to _ _ _ _(快点快点)if were going to catch that train.答案答案:get a move on3637388account for占占比例;是比例;是的原因;说明,解释的原因;说明,解释 【用法拓展用法拓展】account n账目;叙述,描写,报道;
44、账户账目;叙述,描写,报道;账户 take sth.into account 考虑或顾及某事考虑或顾及某事 take account of 考虑考虑 on account of 因为,由于因为,由于 on no account 绝不绝不 on this/that account 由于这个或那个原因由于这个或那个原因 of no account 不重要不重要 Students account for the vast majority of our customers.学生占我们顾客的大多数。学生占我们顾客的大多数。His illness accounts for his absence.他缺席
45、的原因是生病。他缺席的原因是生病。How do you account for your absence from practice?你没来训练作何解释?你没来训练作何解释?美国传统美国传统即学即用即学即用He has to _ to his manager for all his movements.Aallow Bexpress Ccontribute Daccount答案答案:DWe have to _ every possibility into account when drawing up the plan.Amake Btake Ckeep Dturn答案答案:B39409spe
46、ak with one voice 观点一致观点一致 【用法拓展用法拓展】at the top of ones voice 大声地大声地 give voice to sth.公开表达公开表达 have a voice in sth.在在方面有发言权方面有发言权 keep ones voice down 不要说话,安静不要说话,安静 lose ones voice 失声失声 make ones voice heard 使自己的声音被听见使自己的声音被听见 The parents agree that they had to speak with one voice when their chil
47、dren were naughty.父母一致认为孩子调皮时他们的观点必须一致。父母一致认为孩子调皮时他们的观点必须一致。He caught a bad cold and lost his voice.他患有重感冒,嗓子都哑了。他患有重感冒,嗓子都哑了。美国传统美国传统 The children had no voice in deciding where to spend their vacation.孩子们对去哪里度假没有发言权。孩子们对去哪里度假没有发言权。美国传统美国传统即学即用即学即用完成句子完成句子Parents should _ _ _ _ any changes to the s
48、chool curriculum.家长对学校总课程的任何变化应该有发言权。家长对学校总课程的任何变化应该有发言权。答案答案:have a voice inCould you _ _ _ _?Im trying to read.你能安静些吗?我要看书。你能安静些吗?我要看书。答案答案:keep your voice downI always had doubts about the scheme but I never _ _ _ them.我对这个计划一直有些怀疑,但我从未公开表达。我对这个计划一直有些怀疑,但我从未公开表达。答案答案:gave voice to41424310.more th
49、an 【用法拓展用法拓展】(1)more than相当于相当于over,表示,表示“多于多于;超过;超过”。(2)more.than.引导比较状语从句,表示引导比较状语从句,表示“比比多;比多;比更更 加加或与其说或与其说倒不如说倒不如说”。(3)more than名词名词/动词动词/从句形式表从句形式表“远远;不只是;不仅仅是远远;不只是;不仅仅是”。(4)be more than(a little)形容词表形容词表“十分;非常十分;非常”。not more.than.表表“不如不如;没有到;没有到的程度的程度”(前者不如后者前者不如后者)。no less than表表“不少于;多达不少于;
50、多达”的意思的意思。More than 200 people had to be helped to safety when the stadium collapsed.体育馆倒塌后,有体育馆倒塌后,有200多人不得不被扶到安全地带。多人不得不被扶到安全地带。Many companies use computers more than they used to.许多公司比过去更多地使用电脑。许多公司比过去更多地使用电脑。In some places bottled water costs more than a glass of beer.在有些地方瓶装水比一杯啤酒还贵。在有些地方瓶装水比一杯