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
Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materia
Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materia
admin
2010-05-05
35
问题
Radiation occurs from three natural sources, radioactive material in the environment, such as in soil, rock, or building materials; cosmic rays; and substances in the human body, such as radioactive potassium in bone and radioactive carbon in tissues. These natural sources account for an exposure of about 100 million a year for the average American.
The largest single source of man-made radiation in medical X-rays, yet most scientists agree that hazards from this source are not as great as those from weapons-test fallout, since strontium-90 and carbon-14 become incorporated into the body, hence delivering radiation for an entire lifetime. (46)
The issue is, however, by no means uncontroversial; indeed, the last two decades have witnessed intensified examination and dispute about the effects of low-level radiation.
A survey conducted in Britain confirmed that an abnormally high percentage of patients suffering from arthritis of the spine who had been treated with X-rays contracted cancer. Another study revealed a high incidence of childhood cancer in cases where the mother had been given X-rays. (47)
These studies have pointed to the need to reexamine the assumption that exposure to low linear energy transfer presented only a minor risk.
Recently, examination of the death certificates of former employees of a West Coast plant which produces plutonium for nuclear weapons revealed markedly higher rates for cancers of the pancreas, lung, bone marrow and lymph systems than would have been expected in a normal population.
(48)
While the National Academy of Sciences committee attributes these differences to chemical or other environmental causes, rather than radiation, other scientists maintain that any radiation exposure, no matter how small, leads to an increase in cancer risk.
(49)
It is believed by some that a dose of one rem, if sustained over many generations, would lead to an increase of one percent in the number of 1,000 disorders per million births.
In the meantime, regulatory efforts have been disorganized, fragmented, and inconsistent, characterized by internecine strife and bureaucratic delays. A Senate report concluded that coordination of regulation among involved departments and agencies was not possible because of jurisdictional disputes and confusion. (50)
One Federal agency has been unsuccessful in its efforts to obtain sufficient funding and manpower for the enforcement of existing radiation laws, and the chairperson of a panel especially created to develop a coordinated Federal program has resigned.
选项
答案
一家联邦机构为了强化实施现有的辐射法律,竭尽全力去获取充足的资金和人力,但却失败了。因而一个建组目的是为了协调发展这一联邦机构的计划的专题小组,它的主要负责人已经辞职了。
解析
注意本句的主干结构是以"and"连接的复合句。
转载请注明原文地址:https://kaotiyun.com/show/ZP44777K
0
考研英语一
相关试题推荐
TheEU’sclimatechiefisseekingtoextendthebloc’srenewableenergytargets,inamoveapparentlydesignedtoprotectthegr
Rememberbooks?Theywerethosepiecesofpaperwithwordsprintedonthem【C1】________inbetweentwo,sometimes,【C2】________cove
Connectedhomeswilltakelongertomaterializethanexpected.Thefanfarehasgoneonforyears.Analystshaverepeatedlypredi
Overtheyears,pregnantwomenhaveaskedDonaldRedelmeier,atToronto’sSunnybrookHospital,aboutthedangersofdiving,hot
[A]CrisisSeemsFar[B]TheFirmIsatRisk[C]MoreRivalsJoinin[D]NaturalFoodsAreUnreal[E]StopBuyin
Writeanessaybasedonthepiechartbelow.Inyourwriting,youshould1)describethepiechart,and2)stateyouropinionsd
Shortstoriesareduearevival.Inrecentyears,therehavebeencritically【C1】________collectionsbyAmericanwriterssuchas
Theauthorbelievesthat______.ThatAfricaandSouthAmericawereoncejoinedcanbededucedfrontthefactthat______.
Theword"schism"(Line3,Paragraph1)inthecontextprobablymeans______.Paragraphs2and3arewrittento______.
随机试题
下列哪些说法是正确的?()
谵妄的主要特征是
关于白血病发病情况,下列说法错误的是
A.甘露消毒丹B.沙参麦冬汤C.解肌透痧汤D.银翘散E.凉营清气汤丹痧之邪侵肺卫证,治疗宜选
A、热扰心神B、心气大伤,精神散乱C、痰火扰心D、心气虚,精不养神E、风痰上扰独语的病因是
下列关于《节约能源法》说法正确的是()。
由于报警总线开路使火灾报警控制器发出故障,故障指示灯亮,则排除该故障的方法是()。
A公司2016年财务报表主要数据如下表所示:假设A公司资产均为经营资产,流动负债为经营负债,长期负债为有息负债,不变的营业净利率可以涵盖新增债务增加的利息,假设企业各项经营资产、经营负债占营业收入的比不变。要求:如果该公司预计2017年销售增长率
邓小平对社会主义本质所作的概括,一方面强调必须集中力量解放和发展生产力,另一方面指出了解放和发展生产力的手段和目的。它的基本内涵包括()
以下()控件没有Caption属性。
最新回复
(
0
)