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![【配套K12】[学习]2019高考英语一轮复习 Unit 5 First Aid精练 新人教版必修5](https://img.taocdn.com/s1/m/ca700269b307e87101f6967b.png)
Unit 5李仕才[基础回顾]Ⅰ.单句语法填空1．It is vital that these application forms (should) be sent(send) back as early as possible.2．The new technology，if applied (apply) to rice growing，will help increase the grain output.3．With the aid of our professor，we finished the experiment successfully.4．Men and women must be treated(treat) equally in education and employment.5．We were watching (watch) TV when there was a power failure.6．You'd better put things back in place.Otherwise，it will be difficult to find them.7．Two players are out of the team because of injury (injure)．8．These men made themselves famous for their courage and bravery (brave)．9．There was a big storm after midnight and the rain poured down.10．When he got up from the ground, he found his knee bleeding (bleed)．Ⅱ.单句改错(每句一错)1．Under the aid of our English teacher，we have made great progress this term. Under→With2．Whether he could get support from his parents made great difference to the plan. made后加a3．It is clearly stated that these regulations apply for everyone in the community，without exception. for→to4．Little Tom，who got burned while he was setting off fireworks，is treated in hospital now. is后加being5．It's vital that a successful movie pays much attention to its theme and the figures' characters. pays→payⅢ.佳句写作1．信不信由你，你说什么对我没有影响。
Unit 5 First aidⅠ.语法填空Last night my daughter Mary and I were in the mall picking up some Christmas cards 1.when she said，“Dad，I need to go to BuildABear.You know our school are collecting 2.bears (bear)for donation.” “Okay，we can choose a cheap one，”I replied.“No，it has to be a good one from BuildABear，” Mary spoke louder.“Fine，we'll go and see if they have any 3.sales (sell)，but I'm not spending a lot of money，”I said.We got to BuildABear a nd picked out the smallest，cheapest bear，4.which hadn't a matched dress.I told Mary we wouldn't get the bear a dress.Mary 5.stopped (stop)，“We're taking bears to the kids who will spend Christmas in the hospital and who won't get any Christmas toys.It's really important and I real ly want to get a teddy bear for 6.the m (they)．You don't even have to spend money.I'll pay for it.You can take it out of my piggy bank.”While 7.trying (try) my hardest not to cry，I turned around，8.exchanging(exchange) the cheap bear for a normal sized teddy bear.Mary 9.joyfully (joyful) helped dress the bear in a set of clothes.As we checked 10.out，Mary took my credit card and paid happily.But she said，“I need to return it to you because it's for the kids in the hospital.”I have never been so proud of her.Ⅱ.短文改错I was playing at my cousin house.Since his family was rich than mine，he had more toys than I did.There was one on particular I'd always wanted.I put into my pocket when he wasn't looking.I guessed，even at that age，I would never be able to enjoy to playing with the toy or faced my cousin again; I would always know I'd done something te on，my aunt drove me home.When she dropped me off，I pulled out the toy slow and gave it back.She knows what had happened，but she thanked me and ever mentioned it again.答案：I was playing at my house.Since his family was than mine，he had more toys than I did.There was one particular I'd always wanted.I putinto my pocket when he wasn't looking.I guessed，even at that age，I would never be able to enjoy playing with the toy or my cousin again; I would always know I'd done something wrong. on，my aunt drove me home.When she dropped me off，I pulled out the toy and gave it back.She what hadhappened，but she thanked me and mentioned it again.Ⅲ.书面表达假如你是李华，获悉你校英语学习社团准备创办一份中学生英文校刊以促进大家的英语学习。
Unit 5 First aid一、单词表词汇全查验——运用多媒体，提问默写词汇Ⅰ.阅读词汇(英译汉)[第一屏听写]1．bleed vi.& vt. 流血2．ankle n. 踝(关节)3．choke vi.& vt. (使)噎住；(使)窒息4．cupboard n. 橱柜；衣柜5．ray n. 光线；射线6．liquid n. 液体[第二屏听写]7．radiation n．辐射；射线8．pan n. 平底锅；盘子9．stove n. 炉子；火炉10．tissue n. (生物)组织；薄的织物；手巾纸11．swollen adj. 肿胀的12．scissors n．(pl.) 剪刀[第三屏听写]13．basin n．盆；盆地14．bandage n. 绷带15．kettle n. (水)壶；罐16．wrist n. 手腕17．sleeve n. 袖子18．blouse n. 女衬衫19．throat n. 咽喉；喉咙Ⅱ.高频词汇(汉译英)[第四屏听写]1．aid n．& vt. 帮助；援助；资助2．temporary adj. 暂时的；临时的3．injury n. 损伤；伤害4．skin n. 皮；皮肤5．organ n. 器官6．barrier n. 屏障；障碍(物)[第五屏听写]7．poison n．毒药；毒害vt. 毒害；使中毒8．complex adj. 复杂的9．variety n. 变化；多样(化)；多变(性) 10．mild adj. 轻微的；温和的；温柔的11．mildly adv. 轻微地；温和地[第六屏听写] 12．unbearable adj. 难以忍受的；不能容忍的13．squeeze vt.& vi. 榨；挤；压榨14．vital adj. 至关重要的；生死攸关的15．symptom n. 症状；征兆16．pour vt.& vi. 倒；灌；注；涌17．damp adj. 潮湿的18．tight adj. 牢的；紧的；紧密的[第七屏听写]19．tightly adv. 紧地；牢牢地20．firm adj. (动作)稳定有力的；坚定的21．firmly adv. 坚固地；稳定地22．ceremony n. 典礼；仪式；礼节23．bravery n. 勇敢；勇气24．treat vt.& vi. 治疗；对待；款待n. 款待；招待[第八屏听写]25．apply vt. 涂；敷；搽；应用；运用vi. 申请；请求；使用；有效26．pressure n. 压力；挤压；压迫(感) 27．ambulance n. 救护车28．swell vi.& vt. (使)膨胀；隆起29．first_aid (对伤患者的)急救30．fall_ill 生病[第九屏听写]31．electric_shock 触电；电休克32．squeeze_out 榨出；挤出33．over_and_over_again 反复；多次34．in_place 在适当的位置；适当35．a_number_of 若干；许多36．put_one's_hands_on 找到37．make_a_difference 区别对待；有影响；起(重要)作用二、单元核心考点初热身——提供语境，单元考点自测回顾(一)分类识记单词——用时少·功效高⇩积得多平时多输入，用时顺手出(二)语段串记短语——不枯燥·兴趣高⇩积得多平时多输入，用时顺手出(三)仿写用活句式——造佳句·表达高1．vital adj .至关重要的；生死攸关的 单句语法填空①Enough sleep is vital for/to the students' wellbeing and health. ②As far as I'm concerned, it is vital to_keep (keep) accurate records. 单句写作③如果我们要想在生活中发挥作用，重要的一点就是我们应该从小事开始。
![【配套K12】[学习]2019高考英语一轮优练题 Unit 5 First Aid(含解析)新人教版](https://img.taocdn.com/s1/m/3232953e6edb6f1aff001f29.png)
Unit 5 First Aid李仕才(必修5Unit 5)【短文语法填空】Body and FoodOur body, which has close relations with the food that we eat 1 our daily life, is the most important thing that we own, so our body 2 (need) proper treatment and proper nourishment (营养).The old saying ＂An apple a day keeps the doctor away＂ is not as silly as some people think. The body needs fruit 3 vegetables, such as apples, pears, banana, carrots and cabbages, because they contain vitamin C, 4 is very necessary and important to us all. It’s clear that a lack of vitamin C can make people ill and weak easily.In order to get enough needed vitamins, many people take extra vitamins in pill form, 5 (believe) that these will make them 6 (health). But a good diet is made up of nourishing food an d this gives all the vitamins that we need. The body doesn’t need or use extra vitamins, so why waste money on them?Nowadays many people are too busy to bother about eating properly. They throw anything into their 7 (stomach), eating something carelessly and 8 (hurried). The list of illnesses 9 (cause)or made worse by bad eating habits is frightening. It is high time we should realize the importance of having a good diet. If not, it is impossible for 10 (we) to keep fit and strong.【文章大意】健康的饮食对我们的健康有很大的好处，所以我们一定要注意自己的饮食习惯。
Unit 5 First aid1aid n ．& vt .帮助；援助；资助 First aid is a temporary form of to someone who suddenly falls ill or gets injured before a doctor can be found.(教材P 33)急救就是在找到医生之前对突然生病或受伤的人给予临时性的帮助。
(1)⎩⎪⎨⎪⎧ come to one's aid 帮助某人with the aid of 在……的帮助下in aid of 用以援助……(2)⎩⎪⎨⎪⎧ aid sb in (doing ) sth 在(做)某事方面帮助某人aid sb with sth 以某事/物帮助某人aid sb to do sth 帮助某人做某事①She believes the story might aid of the people who the earthquake. 我们正集资以资助那些在地震中失去家园的人。
2vital adj .至关重要的；生死攸关的If the injuries are second or third degree burns, it is vital to get the victim to the doctor or the world.我们绝不能降低安全标准，这是至关重要的，因为在世界上生命是最宝贵的。
3treat vt .& vi .治疗；对待；款待n ．款待；招待 John used these to treat the most severe injuries to Ms Slade's ．治疗；处理；对待①Do not treat this serious matter as a joke.不要把这件严肃的事情当作笑料。
②She spent front of our school.④Many patients are not getting the medical treatment (treat) they need. 许多病人都没有得到他们需要的医疗。
Unit 5 First aidⅠ.情景默写1.The magazine makes complex(复杂的）ideas attractive and accessible to children。
(2017·北京卷）2。
Try to make the hole in a damp（潮湿的)area to increase the water catcher's productivity.(2017·全国卷Ⅰ)3。
Day after day I kept coming up with solutions,but none of them worked。
My fatigue（疲惫）became almost unbearable（难以忍受的）。
(2016·天津卷）4.In fact，women are less likely to have high blood pressure（压力)or to die from heart attacks.(2016·四川卷)5.As everybody knows，cancer doesn’t show any symptoms （症状）in its early stage.6.Cut the lemon in half and squeeze (榨;挤) the juice out into the bowl.7.The skin is our body's largest organ which acts as a barrier (屏障) against disease and the sun’s harmful rays.8。
When he got up from the ground，he found his knee bleeding (流血）。
9.I’ve told you over__and__over__again(反复；多次）not to do that but you won’t listen。
通用版 2019版高考英语一轮复习Unit5Firstaid高考拆组训练新人教版必修Ⅰ.阅读理解AMost buildings are built to stand up straight, but these look as if they might fall over!The church tower of SuurhusenBuilt in 1450, the 27metrehigh church tower lies in Suurhusen, Germany. It was built in wet land on foundations of oak tree trunks (树干). When the land was drained (排水) later, the wood broke down, causing one side of the tower to be a little lower than the other. In 1975, the tower became a real hazard and people were not allowed to enter until the foundations were made strong again. The lean (倾斜) of the tower is now about five degrees.The Leaning Tower of PisaThe work of building the tower began in 1173, and was finally completed in 1372. In fact, it began to lean after just a couple of floors were built. And this condition continued in the centuries after its completion. The tower was finally closed to the public in 1990 after people failed to stabilize (使稳固) its foundations. In 2001, it was reopened after engineers removed soil from underneath its raised side. Now it leans just an angle of 3.97 degrees.Capital Gate of Abu DhabiCompleted in 2011, the Capital Gate tower in Abu Dhabi was designed to lean eighteen degrees. The building stands next to the Abu Dhabi National Exhibition Centre and contains, among other things, a fine hotel with wonderful views of the harbour. Also known as the leaning tower of Abu Dhabi, the tower is one of the tallest buildings in the city.Big Ben of LondonThe building leans 0.26 degrees to the northwest. This was mainly caused by the engineering projects (项目) that have been carried out in the ground below it since the late 1800s. The tower, which has been continuously open since it was completed in 1858, has nowhere near the lean of the Tower of Pisa and is still completely safe to enter.语篇解读：本文是一篇应用文。
Unit 5 First Aid李仕才(必修5Unit 5)【短文语法填空】Body and FoodOur body, which has close relations with the food that we eat 1 our daily life, is the most important thing that we own, so our body 2 (need) proper treatment and proper nourishment (营养).The old saying ＂An apple a day keeps the doctor away＂ is not as silly as some people think. The body needs fruit 3 vegetables, such as apples, pears, banana, carrots and cabbages, because they contain vitamin C, 4 is very necessary and important to us all. It’s clear that a lack of vitamin C can make people ill and weak easily.In order to get enough needed vitamins, many people take extra vitamins in pill form, 5 (believe) that these will make them 6 (health). But a good diet is made up of nourishing food an d this gives all the vitamins that we need. The body doesn’t need or use extra vitamins, so why waste money on them?Nowadays many people are too busy to bother about eating properly. They throw anything into their 7 (stomach), eating something carelessly and 8 (hurried). The list of illnesses 9 (cause)or made worse by bad eating habits is frightening. It is high time we should realize the importance of having a good diet. If not, it is impossible for 10 (we) to keep fit and strong.【文章大意】健康的饮食对我们的健康有很大的好处，所以我们一定要注意自己的饮食习惯。
Unit 5 First Aid李仕才一、阅读理解。
According to a team of researchers，an animal's ability to perceive(感知)time is linked to their pace of life.“Our results lend support to the importance of time perception in animals where the ability to perceive time in a very short time may be the difference between life and death for fast moving creatures，”commented the lead author Kevin Healy from Trinity College Dublin.The study was done with a variety of animals using a phenomenon based on the maximum speed of flashes of light an individual can see before the light source is seen as constant.Dogs，for example，have eyes with a refresh rate higher than humans.One example of this phenomenon at work，the authors say，is the housefly and its ability to avoid being hit.The research shows flies observe motion in a shorter time than our own eyes can achieve，which allows them to avoid being hit.Professor Graeme Ruxton of the University of St Andrews in Scotland，who worked jointly on the research project，said in a statement，“Having eye s that send updates to the brain at much higher frequencies than our eyes do is of no value if the brain cannot process that information equally quickly.Thus, this work highlights the impressive abilities of even the smallest animal brains.Flies might not be deep thinkers，but they can make good decisions very quickly.”In comparison, the tiger beetle(虎甲虫)runs faster than its eyes can keep up，basically becoming blind，which requires it to stop periodically to reevaluate its prey's(猎物)position.Our results suggest that time perception offers an as yet unstudied dimension in which animals can specialize and there is a considerable range to study this system in more detail.1．What is the research mentioned in the passage mainly about?A．Pace of life of animals.B．Time perception of animals.C．Lifetime of small animals.D．Impressive abilities of animals.2．What does Kevin Healy's comment mean in Para.2?A．The ability of animals to perceive time depends on their high moving speed.B．The survival of fast moving animals relies on their ability to perceive time.C．Animals with quicker pace of life have better perception of time.D．Animals with poor ability of time perception have a shorter life.3．Why can houseflies avoid being hit?A．They can think very deeply before they act.B．They can fly much faster than their eyes can keep up.C．They can process information as quickly as they receive it.D．They can send information to the brain more quickly than to their eyes.【解题导语】本文是一篇科普说明文。
Unit 5First aid1aid n ．& vt .帮助；援助；资助 First aid is a temporary form of help given to someone who suddenly falls ill or gets injured before a doctor can be found.(教材P 33)急救就是在找到医生之前对突然生病或受伤的人给予临时性的帮助。
(1)⎩⎪⎨⎪⎧ come to one's aid 帮助某人with the aid of 在……的帮助下in aid of 用以援助……(2)⎩⎪⎨⎪⎧ aid sb in (doing ) sth 在(做)某事方面帮助某人aid sb with sth 以某事/物帮助某人aid sb to do sth 帮助某人做某事①She believes the story might have had a different ending if those good people had not come to her aid.如果那些好心人不来帮助她，她相信这个故事会有不同的结局。
②We are collecting money in aid of the people who have lost their homes in the earthquake.我们正集资以资助那些在地震中失去家园的人。
2vital adj .至关重要的；生死攸关的If the injuries are second or third degree burns, it is vital to get the victim to the doctor or hospital at once.(教材P 35)如果是二度或者三度烧伤，至关重要的是把伤者立刻送去看医生或送往医院。
be vital to 对……至关重要It is vital to do sth 做某事很重要It i s vital that…(should) do sth……是十分重要的It's vital that we (should )_not_lower (not lower) safety standards as life is the most important in the world.我们绝不能降低安全标准，这是至关重要的，因为在世界上生命是最宝贵的。
3treat vt .& vi .治疗；对待；款待n ．款待；招待 John used these to treat the most severe injuries to Ms Slade's hands.(教材P 38)约翰用这些东西处理斯莱德女士手上最严重的伤口。
(1)treat ⎩⎪⎨⎪⎧ sb like/as 把某人当……看待sb well/badly 对待某人好/不好sth seriously 认真对待某事/某物sb/oneself to 用……招待/款待sb for 治疗某人的……病(2)It's my treat.我请客。
(3)treatment n ．治疗；处理；对待 ①Do not treat this serious matter as a joke.不要把这件严肃的事情当作笑料。
②She spent her early years treating her patients for all kinds of diseases and injuries.她早年的时间都花在如何治疗患有各种各样疾病及受伤的病人上。
③I'll treat you to lunch at the restaurant in front of our school.我将请你在我们学校前面的餐馆吃午饭。
④Many patients are not getting the medical treatment (treat) they need. 许多病人都没有得到他们需要的医疗。
⑤For dessert we had fresh strawberries—a real treat.饭后甜点我们吃新鲜的草莓——真是难得的享受。
4apply vt .涂；敷；搽；应用；运用 vi .申请；请求；使用；有效 He slowed the bleeding by applying pressure to the wounds until the police and ambulance arrived.(教材P 38)他使劲地按住伤口，使血流得慢些，一直等到警察和救护车的到来。
(1)apply ⎩⎪⎨⎪⎧ (to…) for (向……)申请……to 适用于……；适应………to将……搽到……上；把……运用到……中oneself to 致力于；集中精力于(2)applicant n ．申请人(3)application n ．申请；申请书；适用；应用①Later I decided to apply my previous experience to learning (learn) how to read and write.后来，我决定把我以前的经验应用到学习怎样读和写中。
②To whom should I apply for a licence?我应该向谁申请执照呢？③Please clean the wound with a clean cloth and then apply the medicine to it.请用一块清洁的布清洗伤口，然后把药涂到上面。
④You will pass your exams only if you really apply yourself (you) to your study. 你只有专心学习，才能通过考试。
⑤The wide application (apply) of electronic computers in science and technology will free man from the labour of complicated measurement and computation.电子计算机在科学技术方面广泛的应用将使人们从复杂的计量和计算中解脱出来。
1in place 在适当的位置；适当 Hold the bandage in place with tape.(教材P 35)用胶带把绷带固定。
in place of代替；取代 in the place of在……位置上 out of place不在适当的位置；不合适 in the first place首先；第一 take place 发生；举行take one's place 就座；代替take the place of 代替；取代①I'm afraid your proposal is not quite in place.恐怕你的提案不太妥当。
②Plastics are now often used in place of wood or metal.现在塑料经常被用来代替木料或金属。
③A new school is set up in the place of the old one.一座新学校在其旧址上建起来了。
④His frank statements were really out of place at the party.他那番坦白话实在不适合在聚会上说。
⑤One of the first things we need to think about is what is life in the first place.我们首先要思考的事情之一是生命最初是什么。
2make a difference 区别对待；有影响；起(重要)作用 It shows that a knowledge of first aid can make a real difference.(教材P 38) 这说明了急救知识的确能发挥重要的作用。
(1)⎩⎪⎨⎪⎧ make a difference to 对……有作用/有影响make some/no/little difference (to…) (对……)有/没作用或影响(2)tell the difference (between…and…)辨别/区分(……与……)①It makes no difference to me whether you go or not.你去不去对我来说都一样。
②Does his absence make a difference to your work?没有他，会影响你的工作吗？③The twins are so alike; it's difficult to tell the difference between them.这对双胞胎长得太像了，很难分辨出来。
if necessary 如有必要Remove clothing using scissors if necessary unless it is stuck to the burn.(教材P34)除非衣服粘贴在烧伤面上，否则就要把衣服脱掉。
如果需要的话，可以使用剪刀。
【句式点拨】本句中的if necessary是状语从句的省略，目的是使语言简洁或避免重复。
在以if, when, though, as, as if等连词引导的从句中，当从句的主语与主句的主语一致或者从句主语为it，且从句谓语部分是be动词时，可省去“主语＋be”部分。
①If necessary, we shall send a telegram home.如有必要，我们就往家里发电报。
②Vide o games can be a poor influence if left (leave) in the wrong hands.如果落在不合适的人的手中，电子游戏就会有一个很坏的影响。
③Whenever possible, he will come to my help.一有机会他就来帮助我。
④While cycling, don't forget the traffic lights.骑车时，不要忘记看红绿灯。
⑤When asked to dance, she said she couldn't.被邀请跳舞时，她说她不会跳。
⑥Though tired, they went on working.虽然累了，但他们仍继续工作。
Ⅰ.品句填词(用所给词的恰当形式或根据语境写一个合适的词)1．The expert has a language barrier in attending such an important meeting, but he should be praised for his bravery (brave).2．First aid is a form of help that is temporarily (temporary) given to someonewho suddenly falls ill or gets injured before a doctor can be found.3．Her son is lying in bed, feeling pain, because he got injured with his right foot severely swollen (swell).4．His father and mother were both killed within one day, leaving him unbearable (bear) hurt and pain for years.5．The boy was badly bleeding. His deskmate gave him first aid immediately applying pressure to the wounded areas.6．He emphasized that in this kind of recession, it is vital that government (should)_take (take) the lead.7．We will have a picnic in the park this Sunday unless it rains or it's very cold.8．Detective Jones said that the victim was attacked with a knife and bled (bleed) to death as a result.9．The government urged people to stay near their workplaces rather than risk a long walk home, as highways leading out of the city center were_choked (choke) and hotels rapidly filled up.10．While pressure is often seen as a bad thing, if used (use) properly, it can actually be a good thing.Ⅱ.单句改错(含本单元的词汇和语法)at all to our friendship.1．Our different views of life made no differencesdifferencean ice cream.2．The teacher treated each of the children fortothey realized they had left their 3．They had just covered three miles whilewhenIDs at home.it is necessary to know some knowledge of first 4．There is no doubt whetherthataid as dangers lie everywhere and accidents happen from time to time.5．The doctor advised her to eat more bean products in the place of meat which might be harmful to her heart.great difference to the children in the small 6．What the volunteers did made ∧avillage.7．Though I told him over and over again to be careful when driven， he wouldn'tdrivinglisten.8．What's worse, some drivers, cyclists and pedestrians do not think it vital ∧obey traffic rules.togetting out of the atmosphere easily, so 9．Carbon dioxide prevents heat ∧fromthe earth is becoming warmer.continuing 10．The moment he saw the poor girl on TV, he determined to aid her ∧inher study.Ⅲ.课文语法填空You have three layers of skin, which act 1．as a barrier against damage. The complex functions of your skin are 2．to_keep (keep) you warm or cool, and prevent your body from 3．losing (lose) too much water. If your skin gets burned, first aid is a very important first step in the 4．treatment (treat) of burns.You may get burned by a 5．variety (vary) of things: hot liquids, steam, fire, radiation, the sun, electricity or chemicals. There are three types of burns 6．depending (depend) on which layers of the skin are burned.If you touch a hot pan, stove or iron for a moment, you will get first degree burns. The burns may affect the top layer of the skin. You can place cool, clean, wet cloths on them 7．until the pain is not so bad.If hot liquids pour on you, you will get second degree burns. You can keep cloths cool by putting them back in a basin of cold water, 8．squeezing (squeeze) them out and placing them on the burned area over and over again.If the burns 9．are_caused (cause) by electric shocks, burning clothes, or severe petrol fires, you may get third degree burns. 10．It is vital to get yourself sent to the doctor or hospital immediately.Ⅰ.阅读理解A(2018·广西师大附属外校高三模拟)Every day, people come into contact with thousands of chemicals. These chemicals are said to be harmless to human health. In fact, the chemicals are considered so safe that we wash with them. We put them on our bodies and even our faces. Other chemical products are used throughout our homes.By the time you walk out of your front door, you have already been exposed tothousands of chemicals.On its own, each chemical seems harmless. But in combination with other chemicals, they may become deadly. That is the finding of a twoyear study by a highprofile(高调的) task force of scientists. The task force was told to investigate the cancercausing po ssibility of chemical mixtures.Linda Gulliver was one of the 174 scientists on the task force. Their job was to study the cancercausing potential of 85 chemicals. All 85 are said to be common in the environment.Ms Gulliver explains that chemicals have the potential or ability to form dangerous mixtures. Even simple minerals can become dangerous when mixed with chemicals found in plastics or beauty products.Working in groups, the scientists explored how different chemical mixtures could lead to cancer. Ms Gulliver's team looked at the ability of different combinations to support the increase of malignant(恶性的) human cells.She says the current way to identify whether chemicals cause cancer is to test them one at a time. This method leads, she adds, to a lo ng list of supposedly “safe” chemicals. She and her team say that approach needs to change.“We definitely need certain research…to find out what mixtures of chemicals would be more harmful than others; what groups of chemicals, when together, would produc e more harmful effects. And at the moment, that is not known.”An estimated one in five cancers has been linked to chemical exposure. It may turn out that the cancercausing villain(恶棍) is not a single chemical at all.语篇导读本文为科普说明文，揭示了多种安全的化学物质相混或成致癌物。
