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
18
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
but
解析
转载请注明原文地址:https://kaotiyun.com/show/7RTd777K
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
Theconferenceexploredthepossibilityofclosertradelinks.
SpaceResearchDoeswalkingonthemoonmakelifebetterforpeopleonearth?【51】alltheproblemsofourownworld,whyshou
ACountry’sStandardofLivingThe“standardofliving”ofanycountrymeanstheaverageperson’sshareofthegoodsandservic
FoodandHealthThefoodweeatseemstohaveprofoundeffectsonourhealth.Althoughsciencehasmadeenormousstepsinma
Itislaiddownintheregulationsthatallmembersmustcarrytheirmembershipcardsatalltimes,
A.theabilitytoworkwithothersB.encouraginggroupmembersC.lackofgoodleadersD.bossingpeoplearoundE.workingout
Acculturationisaprocesswherebythemembersofonecultureadoptthecustomsofanother.
Wheredidclassicalmusicoriginate?
Wheredidriceoriginate?
随机试题
Itiscommonpractice______abatterywhenitstillhassomepowerinit.
A.三焦经循行B.小肠经循行C.肝经循行D.脾经循行E.胆经循行
(2008年多项选择第48题)根据我国企业破产法的规定,在青云公司进入破产程序后,与该公司有关的下列支出属于破产费用的是()。
世界银行、国际咨询工程师联合会规定的项目总建设成本包括()。
热力管道工程施工结束后,应进行()及试运行。
某工业企业按会计准则计提的坏账准备10万元,以下处理正确的是()。
某商业企业2010年有职工70人,资产总额800万元,取得生产经营收入共计860万元,税前扣除项目金额共计857.2万元。2010年度该企业应缴纳企业所得税()万元。
商业保险按照承保可以分为原保险、再保险、共同保险和重复保险。其中重复保险必须具备的条件有()。
承担支持进出口贸易融资任务的政策性银行是()。
设随机变量X的密度函数为f(x)=(-∞<x<+∞).求Cov(X,|X|),问X,|X|是否不相关?
最新回复
(
0
)