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
32
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
example/instance
解析
转载请注明原文地址:https://kaotiyun.com/show/oCTd777K
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
ACountry’sStandardofLivingThe“standardofliving”ofanycountrymeanstheaverageperson’sshareofthegoodsandservic
FoodandHealthThefoodweeatseemstohaveprofoundeffectsonourhealth.Althoughsciencehasmadeenormousstepsinma
Whenamanisbuyingclotheshedoesnotmindhowmuchhehastopayfortherightthings.Themostobviousdifferencebetween
SaveEnergyatHomeOntheaverage,Americanswasteasmuchenergyastwo-thirdsoftheworld’spopulationconsumes.That’s(1)
SaveEnergyatHomeOntheaverage,Americanswasteasmuchenergyastwo-thirdsoftheworld’spopulationconsumes.That’s(1)
Wheredidclassicalmusicoriginate?
______bythelate1990sitspercapitaGNPwasthehighestinScandinavia?______itgaineditsEuropeanUnionmembershipin199
Wheredidclassicalmusicoriginate?
Wheredidriceoriginate?
随机试题
ThepenIamwritingmyletterwithisdifferentfrom______.
A.四肢痉挛性瘫痪B.上肢下运动神经元,下肢上运动神经元瘫痪C.双下肢上运动元瘫痪D.双下肢下运动元瘫痪E.马鞍区感觉障碍及大小便失禁
中医认为,流行性腮腺炎的病位主要在()
预防急性肾小球肾炎的最有效措施是
(共用备选答案)A.1:2000~1:5000高锰酸钾溶液B.0.3%过氧化氢溶液C.1%~2%氯化钠溶液D.3%~5%鞣酸溶液E.药用炭、鞣酸、氧化镁混合物生物碱、氰化物、无机磷中毒,洗胃液选用
由( )组织勘察成果技术交底。
高速公路的路面基层宜选用()。
社会主义和谐社会的核心价值是()。
甲、乙、丙三个数的和是112,甲是乙的5倍,丙比甲大35,则这三个数中最小的是()。
下列情形中,可能发生在西汉百姓生活中的是()。
最新回复
(
0
)