职称英语考试

试题来源：职称英语模拟题-理工类-概括大意
【单选题】

Theimportance of particular metals in the human diet has been realized within thepast few decades， and the idea that geology might berelated to health has been recognized for a number of elements such as iodine， zinc and selenium. For example， soils withlow iodine contents produce crops， and animalsdeficient in iodine. A lack of iodine in the human diet leads to some seriousdiseases.

Theultimate source of metals within the human body is rocks， which weather into soil， gaining or losingsome of their chemical constituents. The crops we eat selectively remove fromthe soil the elements that they require for growth. The water we drink containstrace elements leached from rock and soil. Thus the geology and geochemistry ofthe environments have effects on the chemistry and health of plants， animals and people.

Sofar there is no data to suggest that people living on metal-rich soilsexperience a potential health hazard. The levels of metals within naturallycontaminated soils are generally not high enough to cause serious healthproblems. Living on metal-rich soils does not represent a health risk unlesslarge quantities of soil are digested or metal-rich dust is inhaled. However， small children are particularly exposed to metal-rich topsoil inplaygrounds and gardens. They are also the most likely ones to eat potentiallydangerous metal-rich soil.

Heavymetals are persistent; they do not break down to other chemicals in theenvironment. Industrially polluted sites usually undergo intensive clean-up andrehabilitation because heavy metals are a health concern once they enter thefood chain. Some trace metals are alleged to cause cancer and are also known tocause poisoning.

Incontrast， naturally contaminated soils have not beensubject to risk assessment studies and rehabilitation measures， despite the fact that they frequently possess metal concentrationswell above those of such polluted by humans and above environmental qualitycriteria.

Thereis a vital need to understand the potential risks and long-term health effectsof living on naturally contaminated soils. Future environmental investigationsof naturally polluted soils should concentrate on the potential pathways ofmetals into the food chain and human body. Geologists should be part of suchstudies as they can provide the essential background information on rock andsoil chemistry as well as the chemical forms of heavy metal pollution.

A.No evidence to indicate bad effects of naturally contaminated soil

B.Potential hazards of human contaminated soils

C.Research on channels of heavy metals getting into human food chain

D.Geology and health problems

E.Rocks-the ultimate source of soil pollution

F.Long- term helth effects on children

1.Paragraph 1

2.Paragraph 3

3.Paragraph 4

4.Paragraph 6

A.industrially polluted soils

B.rock and soil chemistry

C.naturally polluted soils

D.the pathways of metals into the food chain

E.the element of iodine

F.the persistence of heavy metals

5.Some serious diseases is connected with deficiency of ……

6.It is extremely necessary to study the long-term effects caused by living on ……

7.Geologists are indispensable in the research project on geology and health dueto their knowledge on……

8.Industrially contaminated sites usually require a thorough clean-up due to ……

试题出处：http://www.examtiku.com/shiti/1684044.html
网考网参考答案：D、A、B、C、E、C、B、F
网考网解析：进入考试题库查看解析
大数据分析：根据网考网与考试题库的统计分析，该试题：
64%的考友选择了A选项
4%的考友选择了B选项
21%的考友选择了C选项
3%的考友选择了D选项
5%的考友选择了E选项
3%的考友选择了F选项
考友解析与评论：
 · 我觉得D、A、B、C、E、C、B、F也不对
 · 审题不仔细
 · 这个答案靠谱吗？