首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
考研
It is predicted that there will be four scientific breakthroughs in the 21st century. We’ll know where we came from. Why doe
It is predicted that there will be four scientific breakthroughs in the 21st century. We’ll know where we came from. Why doe
admin
2015-04-10
111
问题
It is predicted that there will be four scientific breakthroughs in the 21st century.
We’ll know where we came from. Why does the universe exist? To put it another way, why is there something instead of nothing? Since the 1920s, scientists have known the universe is expanding, which means it must have started at a definite time in the past. They even have developed theories that give a detailed picture of the evolution of the universe from the time it was a fraction of a second old to the present. Over the next couple of decades, these theories will be refined by data from extraordinary powerful new telescope.
We’ll crack the genetic code and conquer cancer. In 19th century operas, when the heroine coughs in the first act, the audience knows she will die of tuberculosis in Act 3. But thanks to 20th-century antibiotics, the once-dreaded, once-incurable disease now can mean nothing more serious than taking some pills. As scientists learn more about the genetic code and the way cells work at the molecular level, many serious diseases—cancer, for one—will become less threatening. Using manufactured "therapeutic" viruses, doctors will be able to replace cancer-causing damaged DNA with healthy genes, probably administered by a pill or injection.
We’ll live longer(120 years?). If the normal aging process is basically a furious, invisible contest in our cells—a contest between damage to our DNA and our cells’ ability to repair that damage—then 21st-century strides in genetic medicine may let us control and even reverse the process. But before we push scientists to do more, consider: Do we really want to live in a world where no one grows old and few children are born because the planet can hold only so many people? Where would new ideas come from? What would we do with all that extra time?
We’ll have a brain road map. This is the real final frontier of the 21st century: The brain is the most complex system we know. It contains about 100 billion neurons, each connected to as many as 1,000 others. In the 21st century, we will use advanced forms of magnetic resonance imaging to produce detailed maps of the neurons in operation. We’ll be able to say with certainty which ones are working when you read a word, when you say a word, when you think about a word, and so on.
According to the passage, the aging process is a struggle between
选项
A、destruction and repair.
B、damage and control.
C、control and reverse.
D、repair and reverse.
答案
A
解析
根据本文内容,衰老过程是______之间的斗争?[A]破坏和修复。[B]损害和控制。[C]控制和逆转。[D]修复和逆转。根据题目中的关键词aging process可以把相关信息定位到第四段的:If the normalaging process is…contest in our cells—a contest between damage to our DNAand our cells’ability to repair that damage——then 21st—century strides… 其中破折号的部分是同位语,在考试中,我们可以先不看破折号里的内容,而先看懂句子主干,即:如果说通常的衰老过程主要是我们细胞内的一场激烈而不可见的竞赛的话,那么21世纪遗传医学的巨大成就会使我们能够控制、甚至逆转这一过程。然后再分析附加成分,即:一场对我们的脱氧核糖核酸进行破坏同我们体内的细胞对被破坏的组织进行修复的竞赛。由此,便可直接选出正确答案[A]。
转载请注明原文地址:https://kaotiyun.com/show/vD74777K
0
考研英语一
相关试题推荐
Energywillbeoneofthedefiningissuesofthiscentury.Onethingisclear:theeraofeasyoilisover.Whatwealldonext
Fromthefirstthreeparagraphs,welearnthat______.Accordingtothetext,"nucleartippedmissiles"and"cannonball-sizest
ImagineaBriton’snewyearresolutions:hevowstostopsmoking20cigarettesaday,andabandonhisdailybottleofclaretand
TheFeaturesofSolarandWindEnergySolarandwindenergyseemtohavecapturedthepublic’ssupportaspotentiallybeing
TheFeaturesofSolarandWindEnergySolarandwindenergyseemtohavecapturedthepublic’ssupportaspotentiallybeing
NetworkSafetyAHousecommitteeisreopeningitsinvestigationofInternetservicesthatletcomputerusersdistributemusi
Scientistsaroundtheworldareracingtolearnhowtorapidlydiagnose,treatandstopthespreadofanew,deadlydisease.SAR
AmericansBecomePessimisticfromOptimisticAmericanshavelongpridedthemselvesasbeingpartofanoptimisticsociety.B
(46)Thejobofraisingchildrenisatoughone.Childrendon’tcomewithaninstructionmanual.Andeachchildisdifferent.So
(46)Thejobofraisingchildrenisatoughone.Childrendon’tcomewithaninstructionmanual.Andeachchildisdifferent.So
随机试题
建筑群综合布线交接间的面积不应小于(),如覆盖的信息插座超过200个时,应适当增加面积。
对于公共民用建筑,在高层建筑中将性质重要、火灾危险性大、疏散租扑救难度大的建筑划分为()。
根据《上海证券交易所股票上市规则》,上市公司披露的定期报告包括()。Ⅰ.年度报告Ⅱ.中期报告Ⅲ.季度报告Ⅳ.临时报告
2016年3月某企业开始自行研发一项非专利技术,至2016年12月31日,研发成功并达到预定可使用状态,累计研究支出为160万元,累计开发支出为500万元(其中,符合资本化条件的支出为400万元)。该非专利技术使用寿命不能合理确定,假定不考虑其他因素,该经
某小学王老师在讲授“葡萄沟”一课时,通过播放新疆吐鲁番葡萄沟的纪录片,让学生感受到葡萄沟出产的水果种类多、葡萄品种全的自然风光,从而激发学生的学习兴趣。在教学中,王老师贯彻的教学原则是()。
依次填入下列句中横线处的词语恰当的一项是:(1)抗洪工程是百年大计,即使是在紧急关头,也不能______时间紧迫而降低质量要求。(2)在这样的实验室里,工作人员的动作要求______考虑,要准确而缓慢地进行。(3)“神舟号”在辽
UNIX操作系统属于下列哪种类型的操作系统______。
假定在窗体上添加了一个通用对话框控件,其名称为CD1,并有如下程序段:CD1.ShowOpenCD1.DefaultExt="doc"在打开文件的对话框中选择了"c:\file1.txt"文件,则FileTitle属性的值是
(1)在考生文件夹下有工程文件sjt3.vbp。程序运行时的窗体如图3—185(a)所示。输入商品名称后,选中一种付款方式,则“成交”按钮变为可用,选择一种或多种“服务”后,单击“成交”按钮,则把相应信息显示在下面的图片框中,如图3.185(b)所示。若不
Mannersaredifferentineverycountry;buttruepolitenessiseverywherethesame.Mannersareonly【C1】_____helpswhichignoran
最新回复
(
0
)