The use of chemicals in almost all areas o

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问题:

The use of chemicals in almost all areas of life has become a commonplace phenomenon. There is growing evidence, however, that chemicals in the environment, including pesticides, may contribute to some illnesses. While studies are still being conducted, preliminary conclusions point to the verdict that such chemicals are indeed negatively impacting those humans to whom they are exposed.

Children are especially vulnerable to toxic substances. Pound for pound, they eat, drink and breathe more than adults, all of which exposes them more heavily to those chemicals to which most individuals encounter on a daily basis. Furthermore, their bodies are still in developing stages, exacerbating the negative effects of those chemicals, which negatively impact them.

Of 50 types of pesticides commonly used in American schools, a study conducted by the National Coalition Against the Misuse of Pesticides found that many caused negative reactions in laboratory animals. Such negative effects included kidney and liver damage, cancer, and neurological and reproductive problems.

These implications of these findings are far-reaching. Given the variety of harmful effects attributed to those pesticides tested, one must pause and consider whether it is wise to continue their use in the nation’s schools, where children will be constantly exposed to them. Activists have lobbied for the elimination of such use with a degree of success, and recent findings, if supported by further analysis and confirmation, may help further the cause. A long term solution or alternative, however, remains elusive.

In the short run, however, there may be some measures that can be taken to mitigate the harmful effects of dangerous pesticides. The American Medical Association’s Council on Scientific Affairs concluded in a 1997 report that given the "particular uncertainty.., regarding the long-term health effects of low-dose pesticide exposures," it is "prudent" for adults and children to limit their exposure and to "consider the use of the least toxic chemical pesticides or non-chemical alternatives. \

The author cites the American Medical Association’s advice in paragraph 5 in order to()

A. present more factual details to clarify the issue

B. present an alternative theory for consideration

C. present a recommendation from a reputable source

D. present a solution drawn from all the evidence considered

考点:普通考研西医综合西医综合
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对受到一般细菌和亲脂病毒污染的物品,可选用

A.中效或低效消毒法

B.高效消毒法

C.灭菌法

D.低效消毒法

E.中效消毒法

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目前,国家电网公司已建成“三纵四横”电力主干通信网络,形成了以光纤通信为主,()、()

A.微波、载波

B.红外线、微波

C.超声波、载波

D.电磁波、载波

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若某居住区的住宅用地面积为50000m2,住宅建筑基地总面积为25000m2,住宅建筑总面积为100000m2,则该居住区的住宅建筑净密度为( )。

A.20%
B.25%
C.50%
D.75%

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客房价格包含客人的住宿费和每日三餐全部费用的计价方式是()。

A、欧式计价

B、美式计价

C、百慕大计价

D、修正美式计价

题型:单项选择题

有些液压系统为什么要有保压回路?它应满足哪些基本要求?

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