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
外语
"I have great confidence that by the end of the decade we’ll know in vast detail how cancer cells arise," says microbiologist Ro
"I have great confidence that by the end of the decade we’ll know in vast detail how cancer cells arise," says microbiologist Ro
admin
2015-05-29
28
问题
"I have great confidence that by the end of the decade we’ll know in vast detail how cancer cells arise," says microbiologist Robert Weinberg, an expert on cancer."But," he cautions, "some people have the idea that once one understands the causes, the cure will rapidly follow.Consider Pasteur, he discovered the causes of many kinds of infections, but it was fifty or sixty years before cures were available."
This year, 50 percent of the 910,000 people who suffer from cancer will survive at least five years.In the year 2000 , the National Cancer Institute estimates, that figure will be 75 percent.
For some skin cancers, the five-year survival rate is as high as 90 percent.But other survival statistics are still discouraging-13 percent for lung cancer, and 2 percent for cancer of the pancreas.
With as many as 120 varieties in existence, discovering how cancer works is not easy.The researchers made great progress in the early 1970s, when they discovered that oncogenes, which are cancer-causing genes, are inactive in normal cells.Anything from cosmic rays to radiation to diet may activate a dormant oncogene, but how remains unknown.If several oncogenes are driven into action, the cell, unable to turn them off, becomes cancerous.
The exact mechanisms involved are still mysterious, but the likelihood that many cancers are initiated at the level of genes suggests that we will never prevent all cancers."Changes are a normal part of the evolutionary process," says oncologist William Hayward.Environmental factors can never be totally eliminated; as Hayward points out, "We can’t prepare a medicine against cosmic rays."
The prospects for cure, though still distant, are brighter.
"First, we need to understand how the normal cell controls itself.Second, we have to determine whether there are a limited number of genes in cells which are always responsible for at least part of the trouble.If we can understand how cancer works, we can counteract its action."
The example of Pasteur in the passage is used to______.
选项
A、predict that the secret of cancer will be disclosed in a decade
B、indicate that the prospects for curing cancer are bright
C、prove that cancer will be cured in fifty to sixty years
D、warn that there is still a long way to go before cancer can be conquered
答案
D
解析
从第1段最后一句话“想一想Pasteur吧,他发现了许多传染病病因,但是过了五六十年才有了治疗方法”可知,D项为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/hSLO777K
0
考博英语
相关试题推荐
SofarasIknow,MissHannahArendtwasthefirstpersontodefinetheessentialdifferencebetweenworkandlabor.Tobehappy
49TheendofwinteristhemostdangeroustimefortheanimalsinYellowstoneParkasfoodbecomeseven______.
Despitedecadesofscientificresearch,nooneyetknowshowmuchdamagehumanactivityisdoingtotheenvironment.Humansare
BeforehighschoolteacherKimberlyRughgotdowntobusinessatthestartofarecentschoolweek,shejokedwithherstudents
Likemanyconceptsinsocialpsychology,aggressionhasmanydefinitions,evenmanyevaluations.(l)Somethinkofaggressionas
Anthropologists,psychologistsandothershavebegunseekingtherootsofambitioninfamily,culture,gender,genesandmore.T
OnSeptember7,2001,a68-year-oldwomaninStrasbourg,France,hadhergallbladder(胆囊)removedbysurgeons’operating,viac
A、ambitionB、conscienceC、responsibilityD、challengeCambition意为“抱负,雄心”;conscience意为“良心”;responsibility意为“责任,义务”;challenge意为“挑战”
Thelatestclocktobeinventedisa"languageclock"whichhelpsustodeterminethedatesofcertainoccurrences.Thisclockr
AfricanAmericanwomen’ssearchforsocietalacceptanceoftenencompassesstrugglebetweennaturalandsociallyconstructedidea
随机试题
以下哪项与新生儿易患败血症无关
焊后热处理规范中包括哪些主要规范参数?
关于卵巢的血管说法正确的是
乳腺癌最常见的部位是乳房的
患者发黄干枯,稀疏易落的临床意义是
承包商在进行合同实施趋势分析时,需针对合同实施偏差情况以及可以采取的措施,分析在不同措施下合同执行的结果与趋势,包括()等。
夫璇玉致美,不为池隍之宝;桂椒信芳,而非园林之实。岂其深而好远哉,盖云殊性而已。故无足而至者,物之藉也;随踵而立者,人之薄也。若乃巢高之抗行,夷皓之峻节,故已父老尧禹,锱铢周汉,而绵世浸远,光灵不属,至使菁华隐没,芳流歇绝,不其惜乎!虽今之作者,人自为量,
甲和乙两个公司2014年的营业额相同,2015年乙公司受店铺改造工程影响,营业额比上年下降300万元。而甲公司则引入电商业务,营业额比上年增长600万元,正好是乙公司2015年营业额的3倍。则2014年两家公司的营业额之和为多少万元?()
单纯利用水的流动来计时有许多不便,人们逐渐发明了利用水做动力,以驱动机械结构来计时。公元前117年,东汉的张衡制造了大型天文计时仪器——水运浑天仪(theWater-drivenCelestialGlobe),初步具备了机械性计时器的作用。随后历代都
在窗体上画一个命令按钮,其名称为Command1,然后编写如下事件过程:PrivateSubCommand1_Click()x=-3IfSgn(x)Theny=Sgn(x^2)E
最新回复
(
0
)