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
Polluted water is nothing new in the United States. We have lived through flaming rivers and caustic creaks that could take the
Polluted water is nothing new in the United States. We have lived through flaming rivers and caustic creaks that could take the
admin
2013-06-17
53
问题
Polluted water is nothing new in the United States. We have lived through flaming rivers and caustic creaks that could take the hide off a hound. For decades, however, efforts to safeguard drinking water were hampered because no one had an accurate sense of the full range of contaminants in the water supply, nor of the geographic extent of the pollution. This year two separate research teams unveiled sophisticated new tools to find out exactly what chemical dangers are lurking in freshwater streams.
"Research in Europe in the 1990s showed that pharmaceuticals were turning up in the water," says Dana Kolpin, leader of a U. S. Geological Survey Water Resources Division research ream that developed five new analytic methods for measuring water contaminants." Our big effort was to develop methods to measure very small amounts of organic chemicals. ’ The research team fanned out across 30 states nationwide and conducted two years of sampling from 139 streams. They were chosen, says Kolpin, on the basis of their location downstream from" intense urbanization and livestock production." In a study published in the March 15 Journal of Environmental Science & Technology, Kolpin and his colleagues reported they looked for 95 different contaminants, such as antibiotics, steroids, hormones, antioxidants, plasticizers, and various solvents. They found 82 of them. Nearly 80 percent of the streams showed one or more of the contaminants. The median stream contained seven. Even the good news--that the most frequently detected contaminants like fecal steroids, cholesterol, insect repellent, caffeine, disinfectant, fire retardant, and detergents were found in generally low concentrations--had to be qualified. Many of those compounds have no guidelines for safe amounts, and little is known about the effects of chronic exposure or the interactive effects of compounds that have been detected together.
In a related Environmental Protection Agency study that is still in progress, a team of scientists at the Johns Hopkins Whiting School of Engineering is using gas chromatography and mass spectrometry to detect the presence of various anticonvulsants and anticancer drugs in drinking water. Led by Lynn Roberts and Ed Bouwer, the researchers track samples at sewage-treatment facilities in Massachusetts and Maryland to determine whether and in what quantities pharmaceuticals are getting through the waste-treatment plants and the extent to which they may be accumulating in coastal waters.
The goal of both research teams is to provide a baseline of what organic compounds are in the water, in what quantities, and how they are getting there--key steps toward ensuring that the water we drink isn’t killing us.
Which of the following can serve as the best title of the passage 9?
选项
A、The Organic Compounds in the Water.
B、Drinking Water Drugged.
C、Polluted Rivers and Streams.
D、Guidelines for Safe Water.
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/67M7777K
0
大学英语四级
相关试题推荐
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbestpicture.Growthingrossdomesticproductwas4.1pe
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbestpicture.Growthingrossdomesticproductwas4.1pe
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbestpicture.Growthingrossdomesticproductwas4.1pe
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbestpicture.Growthingrossdomesticproductwas4.1pe
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbestpicture.Growthingrossdomesticproductwas4.1pe
Lastyear’seconomyintheUnitedStatesshouldhavewontheOscarforbestpicture.Growthingrossdomesticproductwas4.1pe
Individualism,independence,andself-relianceareperhapsthemostdistinctiveAmericancharacteristics.IntheUnitedStates,
Individualism,independence,andself-relianceareperhapsthemostdistinctiveAmericancharacteristics.IntheUnitedStates,
随机试题
王某、赵某于2007年1月7日共同抢劫个体户李某,在抢劫中,持匕首刺中李某的腹部,致李某失血过多而死亡。该案经公安机关侦查终结后,移送人民检察院审查起诉,人民检察院以抢劫罪将二人起诉到某市中级人民法院。请根据上述情况,回答以下问题。本案中,王某、赵某可
腹部闭合性损伤时,判断是否合并内脏伤最简单最有价值的检查方法是
沙女士,24岁,因早孕要求终止妊娠。行吸宫术,术中突然出现心率缓慢、胸闷、出汗及面色苍白等征象为她提供的术后护理内容,正确的是()
疼痛,皮色焮红,灼热疼痛,遇冷则痛减,多属疼痛,皮色不红,不热,痠痛,得温痛缓,多属
【2014】某施工单位制定了严格详细的成本管理制度,建立了规范长效的成本管理流程,并构建了科学实用的成本数据库。该施工单位拟参加某一公开招标项目的投标,根据本单位成本数据库中类似工程项目的成本经验数据,测算出该工程项目不含规费和税金的报价为8100万元,其
对于向不同的会计资料使用者提供的财务会计报告编制依据不一致的,由县级以上人民政府财政部门责令限期改正,可以对单位并处( )。
Google和百度这两种搜索引擎都是通过互联网提取各个网站的信息(以网页文字为主)建立数据库,然后检索与用户查询条件匹配的相关记录,最后按照一定的顺序将结果反馈给用户。这两种搜索引擎都属于()。
南宋人物画《李白行吟图》的作者是()。
明朝中后期,倭寇不断侵扰我国东南沿海地区,当时的著名抗倭英雄是( )。
Inthissection,youaregoingtoreadapassagewithtenstatementsattachedtoit.Eachstatementcontainsinformationgiveni
最新回复
(
0
)