The use of chemicals in almost all areas o

题型:单项选择题

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 mentions the exaggerated effects of chemicals on children in paragraph 2 to()

A. prove that pesticides are dangerous to all humans

B. show that children are more susceptible to many kinds of dangers

C. suggest a solution to the problem of pesticides

D. identify one group that pesticides hurt in particular

考点:普通考研西医综合西医综合
题型:单项选择题

某开发商将8000万元投入一房地产开发项目,假设此项目开发周期为3年,当前房地产开发投资的年投资利润率为20%,贷款利率为10%,已知在总投资中开发商自有资金占30%,则其自有资金的年平均投资收益率为( )。

A.40.9%

B.54.7%

C.56.7%

D.61%

题型:单项选择题

某企业某车间月初在产品成本为4 000元,本月生产产品耗用材料80 000元,生产工人工资及福利费16 000元,该车间管理人员工资及福利费8 000元,车间水电等费用8 000元,月末在产品生产成本8 800元,厂部预付半年报刊费2 400元(含本月)。则该车间本月完工产品生产成本总额为( )元。

A.112 400

B.116 400

C.107 200

D.107 600

题型:单项选择题

为了防止计算机病毒的传染,应该做到

A.不要拷贝来历不明的软盘上的程序

B.对长期不用的软盘要经常格式化

C.对软盘上的文件要经常重新拷贝

D.不要把无病毒的软盘与来历不明的软盘放在一起

题型:单项选择题

某工业架空热力管道工程由型钢支架工程和管道工程两项工程内容组成。由于现行预算定额中没有适用的定额子目,需要根据现场实测数据,结合工程所在地的人工、材料、机械台班价格,编制每10t型钢支架和每10m管道工程单价。

若测得每焊接1t型钢支架需要基本工作时间为54h,辅助工作时间、准备与结束工作时间、不可避免的中断时间、休息时分别占工作延续时间的3%、2%、2%、18%。试计算每焊接1t型钢支架的人工时间定额和产量定额。

题型:单项选择题

遇有六级以上强风、浓雾等恶劣气候,不得进行下列何种作业()

A.悬空高处作业

B.室内装修作业

C.露天攀登作业

D.起重设备安拆作业

E.钢筋加工作业

更多题库