职称英语
学校介绍
|
培训课程
|
优惠活动
|
考试动态
|
备考经验
|
培训风采
|
考试问答
最新问答
2016年职称英语考试时间预计:3月26日
距离职称英语考试还剩:
00天 00时 00分 00秒
考试介绍
考试内容
成绩有效
考试级别
考试时间
报考类别
成绩查询
合格标准
学员风采

职称英语考试《卫生类》历年真题精选( 2 )

发布时间:2017-02-09        来源:华商教育
导读:

  ADHD Linked to Air Pollutants

  Children have an increased risk of attention problems,seen as early as grade school, if their moms inhaled(吸入)a certain type of air pollution when they were pregnant. That's the finding of a new study. Released when things aren't burned completely, this pollution is known as polycyclic aromatic hydrocarbons, PAHs. The biggest sources of these PAHs: the burning of fossil fuels, wood trash.

  Frederica Perera wks at Columbia University's Mailman School of Public Health in New Yk City. She researches how exposure to things in the environment affects children's health. In a new study, she  her team studied the exposure to air pollution of 233 nonsmoking pregnant women in New Yk City. Because burning tobacco can spew(排放)PAHs into the air  lungs, Perera's team focused on nonsmokers. The researchers wanted to probe(探查)other sources of PAHs, ones that would have been hard f an individual to avoid.

  The team started by testing the blood of each woman during pregnancy. The reason: Any PAHs in a woman's blood would also be available to the baby in her womb. Nine years later, the researchers investigated signs of attention problems in these children, now age 9. They asked each child's mother a series of questions. These included whether her child had problems doing things that needed sustained(长期的)mental efft, such as homewk  games with friends. The scientists also asked if the kids had trouble following instructions  made frequent, careless mistakes. All of these can be symptoms of a disder called Attention Deficit Hyperactivity Disder,  ADHD. About one in 10 U.S.children has ADHD.

  Among the women studied, traffic  home heating were the primary sources of air pollution exposure, Perera  her team suspect. Some of these women had low levels of PAHs in their blood. Others had high levels. Those with high levels were five times as likely to have children who showed attention problems by age 9. The new findings were published November 5 in the journal PLOS ONE.

  (单项选择题)Nonsmoking mothers were ed because the effect of smoking on PAHs was unclear.

  A.Right

  B.Wrong

  C.Not mentioned

  【答案】B

  【考点】2015

  【解析】由文章第二段中的In a new study , she  her team studied the exposure to air pollution of 233 nonsmoking pregnant women in New Yk City. Because burning tobacco can spew(排放) PAHs into the air  lungs, Perera's team focused on nonsmokers.可知,选择非吸烟的怀孕母亲的原因是因为吸烟会导致环芳香烃的吸入。故可知,吸烟和环芳烃(PAHs)的关系是明确的,因此题干错误。


成都华商教育
四川成都职称英语培训网
咨询电话:400-011-2880 咨询QQ:2946912248 联系邮箱:cdhsjy@sina.com
总校地址:中国·成都金牛区三洞桥路12号2F