1、空白演示单击输入您的封面副标题Language and GrammarFocus on Language:Difficult sentencesGardeners have been using a form of cloning when they take a cutting from a plant and place it in a suitable medium,such as soil.园丁们从植物上截取一段，放在合适的培养基中（例如土壤），就是一种克隆。Page52Focus on Language:Difficult sentencesIn comparison with ot
2、her species,cloning primates has proved to be“much harder”,and doing so with non-productive cells was even complicated.与其他的物种相比，克隆灵长类动物要“困难得多”，而使用非生殖细胞克隆则更为复杂。Page52Focus on Language:Difficult sentencesThe reason they worked so hard to break this technical barrier was to get animals with edited gene
3、s and produce animal models that are helpful for medical research and human health.他们之所以如此努力地要突破这一技术壁垒，是为了获得经过基因编辑的动物，研制动物模型，为医学研究和人类健康发展做贡献。Page53Focus on Language:Difficult sentencesThe successful cloning of primates has led to worldwide praise as a huge breakthrough that might lead to cures for v
4、arious diseases and may also offer clues on how to prevent the aging process.灵长类动物的成功克隆获得了全世界的赞誉，被认为是一项巨大的突破，从而为治愈多种疾病、延缓衰老提供线索。Page53Focus on Language:Difficult sentencesWhile some people believe it is crucial for scientific advancement,others raise moral concerns.尽管有些人认为这对于科学的进步至关重要，但也有人提出了道德方面的担忧
5、。Page53Focus on Language:Difficult sentencesResearchers insist that the science of cloning should be further explored and advanced.研究人员认为，克隆科学应进一步得到探索与发展。Page53The perfect(完成时完成时)：present perfect现在完成时 present perfect continuous 现在完成进行时 past perfect 过去完成时 past perfect continuous过去完成进行时完成时：结果、完成完成进行时：
6、动作、持续/重复Focus on Grammar:The perfect1.Natural cloning has been going on for generations.2.Gardeners have been using a form of cloning when they take a cutting from a plant 3.For years,there had been attempts to clone animals.Identify the tense of the sentences.Focus on Grammar:The perfect4.Cloning p
7、rimates has been proved to be“much harder”than cloning other species.5.Dr.Sun Qiang said they had been wholly devoted to the research 6.Dr.Sun Qiang said they had been taking care of more than 1,000 monkeys 24 hours a day,7 days a week Focus on Grammar:The perfect1.Natural cloning has been going on
8、for generations.2.Gardeners have been using a form of cloning when they take a cutting from a plant 3.For years,there had been attempts to clone animals.present perfect continuous 现在完成进行时present perfect continuous 现在完成进行时past perfect 过去完成时Focus on Grammar:The perfect4.Cloning primates has been prove
9、d to be“much harder”than cloning other species.5.Dr.Sun Qiang said they had been wholly devoted to the research6.Dr.Sun Qiang said they had been taking care of more than 1,000 monkeys 24 hours a day,7 days a week.present perfect 现在完成时past perfect 过去完成时past perfect continuous 过去完成进行时Focus on Grammar:
10、The perfectComplete the passage with the proper form of the words in brackets.On Thursday,the Institute of Neuroscience announced it 1 _(clone)two monkeys using non-reproductive cells.It is reported that researchers all around the world 2 _(conduct)tests on animals,such as mice and dogs for many yea
11、rs,but couldnt find a way to clone monkeys.had cloned have been conducting Focus on Grammar:The perfectComplete the passage with the proper form of the words in brackets.The news of the successful cloning 3 _(attract)attention from around the world.However,cloning primates 4 _(also raise)ethical con
12、cerns.For example,some people 5 _(discuss)issues concerning how clones will be treated in society.has attracted has also raised have been discussingFocus on Grammar:The perfectLanguage and Grammar1.Each disease can only officially be classified as an epidemic once a certain number of deaths have occ
13、urred from the disease.只有致死病例达到一定数量只有致死病例达到一定数量，某种疾病才会被正式定某种疾病才会被正式定性为流行病。性为流行病。Only eleven of these accidents were classified as major.We can classify these expressions into four types.Focus on sentences这些事故中只有十一例被判定为重大事故。可以把这些表达分为四种类型。2.Families who had only just got through the war now had to bur
14、y their loved ones who had died of disease.刚刚熬过战争的人们现在不得不埋葬他们死于疾病的刚刚熬过战争的人们现在不得不埋葬他们死于疾病的亲人。亲人。get through 渡渡过过/熬过熬过（困难或不快的时期困难或不快的时期）It is hard to see how people will get through the winter.Focusing on that goal helps me get through tough times.Focus on sentences很难看出人们将如何渡过这个冬天。专注于这个目标有助于我渡过难关。3.Th
15、e virus was extremely infectious and the survival rate was as low as 30%in some areas,indicating that very few people got over it.该病毒传染性极强，一些地区的存活率低至该病毒传染性极强，一些地区的存活率低至30%，也就，也就是说很少有人能康复。是说很少有人能康复。get over 从从（不快或疾病中不快或疾病中）恢复过来恢复过来He was disappointed at not getting the job,but hell get over it.We are
16、 certain that he will get over his illness.Focus on sentences没得到这份工作他非常失望，不过他会想开的。相信他一定会战胜疾病。get 相关短语：1.I spoke slowly,but my meaning didnt get across._2.How does she get by on such a small salary?_3.Its time we get down to business._4.Public transportation provides a cheap way to get around in Beij
17、ing._5.I was determined to get at the truth._6.They try to get out of their habits._被理解被理解勉强生活勉强生活开始做开始做出行；走动出行；走动查明查明改掉改掉Focus on sentences4.With recent press reports drawing parallels between birds flu and killer epidemics of the past,Jim Smith looks at the sometimes depressing history of epidemic
18、s for clues about how we can create a more positive future without epidemics.最近有新闻报道，吉姆最近有新闻报道，吉姆史密斯将禽流感和过去致命的史密斯将禽流感和过去致命的流行病做对比，在屡屡令人沮丧的流行病史中寻找线索，流行病做对比，在屡屡令人沮丧的流行病史中寻找线索，从而创造一个远离流行病的美好未来。从而创造一个远离流行病的美好未来。Focus on sentences注注“with+名词名词+不定式不定式/动词动词 ing/过去分词过去分词/介词介词短语等短语等”结构常作状语，表示伴随、原因、条件等，还结构常作状语
19、，表示伴随、原因、条件等，还可作定语。可作定语。Focus on sentencesWith tears of joy in her eyes,she saw her daughter married.她眼里噙着高兴的泪水，看着女儿结婚。With you to help us,well surely succeed.有你来帮我们，我们一定会成功。With prices going up so fast,we cant afford luxuries.由于物价猛涨，我们买不起高档商品。They sat together around the table,with the door shut.他们
20、关着门围桌而坐。The police kept shouting at the man to come out with his hands up.警察一直大声呼喊，让那位男子举起双手出来。The workforce is made up of 400 workers,with most of them women.职工一共有400人，其中大多数是女性。Focus on sentencesgo:at,over,through,awayget:at,into,over,through,up,away come:at,into,over,up with,up,awayFocus on gramma
21、r:Finish the blanks1.The medical expert asked a few questions to try to _ the truth.2.Books on epidemics _ the medicine section of the store.3.During this course,well _ the main causes of bird flu.4.It took him a week to _ the e atgo undergo overget over5.Has your headache _ yet?6.The price of this
22、drug has _ twenty cents since August.7.Are you willing to stand by him and help him _ this difficult time.8.Jordan has _ some creative ideas for helping the sick.got over gone upgo throughcome up withFocus on grammar:Finish the blanksFind the correct prepositions to complete each of these phrases fr
23、om the text.1.have been happening _ as long as there have been people living _ Earth.(para.1)2.up to 50%_ the areas population died _ the epidemic.(para.5)3.making it one _ the main causes _ the fall _ the Roman Empire.(para.5)4.struck _ the end _ the World War I(para.6)foronoffromofofofnearofFocus on grammar:Finish the blanks
