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
Multidisciplinary science is all the rage these days. Even (31), the overlap between archaeology and pharmacology is not, at fir
Multidisciplinary science is all the rage these days. Even (31), the overlap between archaeology and pharmacology is not, at fir
admin
2009-06-24
76
问题
Multidisciplinary science is all the rage these days. Even (31), the overlap between archaeology and pharmacology is not, at first (32), obvious. But there is a connection. An analytical technique developed for the (33), used to work out how old things are, is now (34) used in the latter, to see if promising drugs are likely to fail (35) expensive clinical trials are undertaken.
At the (36), a third of drug candidates do not pass such trials. This may be (37) they fail to reach the part of the body where they are (38) to work—many molecules, for (39), cannot cross from the bloodstream into the brain. Or it may be that the body breaks down the active ingredients before the drug has time to act. Identifying (40) problems early in the testing process would be a boon. Trials on (41) can help, but how other species react is not always a good indication of how people will. What is needed is a way of testing potential drugs on people, (42) in a way that cannot possibly cause any harm. That is (43) the archaeologists come in.
(44) decades, archaeologists have used a technique called carbon dating to work (45) how old their finds are. Some of the carbon dioxide absorbed by plants during photosynthesis is (46). That is because it contains carbon atoms which are (47) than run-of-the-mill carbon, and are unstable. The radioactive carbon atoms weigh 14 atomic units, (48) nm-of-the-mill ones weigh 12 units. Food grains, scraps of cloth and so on can thus be dated by finding out how (49) radioactive carbon is left in them: the less there is, the (50) they are. (278 words)
选项
答案
older
解析
转载请注明原文地址:https://kaotiyun.com/show/iRTd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
SpaceResearchDoeswalkingonthemoonmakelifebetterforpeopleonearth?【51】alltheproblemsofourownworld,whyshou
FoodandHealthThefoodweeatseemstohaveprofoundeffectsonourhealth.Althoughsciencehasmadeenormousstepsinma
GenerationGapAfewyearsago,itwasfashionabletospeakofagenerationgap,adivisionbetweenyoungpeopleandtheire
SaveEnergyatHomeOntheaverage,Americanswasteasmuchenergyastwo-thirdsoftheworld’spopulationconsumes.That’s(1)
TheImportanceofAgricultureinChinaThedevelopmentofagricultureandthebalancebetweenfoodandpopulationareChina’
Acculturationisaprocesswherebythemembersofonecultureadoptthecustomsofanother.
Wheredidclassicalmusicoriginate?
A=ChangLingB=DingLingC=EmperorQianLong’sTombWhichtomb...Maintaininganimperialtraditionthatoriginatedfr
Wheredidclassicalmusicoriginate?
Thestaffmembersoftherestaurantdon’tshareindecision-making.
随机试题
用要素饮食检查氮的排出量需收集
砂仁具有的功效是()
混凝土试件尺寸公差不得超过()。
对组装好的散热器组应进行水压试验,试验压力为工作压力加( )。
“先授信,后用信”是个人抵押授信贷款的特点之一。
()是指贷款人根据借款人的提款申请和支付委托,将贷款资金交付给符合合同约定用途的借款人交易对象。
关于国内生产总值的说法,正确的是()。
已采用公允价值模式计量的投资性房地产,不得从公允价值计量模式转为成本计量模式。()
TheprofessortalkedtoAmericanandBrazilianstudentsaboutlatenessinbothaninformalandaformalsituation:lunchwitha
有如下程序:#nclude<iostream>usingnamespacestd;classBase{public:voidfun1(){cout<<"Base\n";}virtualvoidfun2(){cout<<"
最新回复
(
0
)