The team started by testing the blood of each woman during pregnancy.The reason:Any PAHs in a womans 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 childs mother a series of questions.These included whether her child had problems doing things that needed sustained(长期的) mental effort,such as homework or games with friends.The scientists also asked if the kids had trouble following instructions or made frequent,careless mistakes.All of these can be symptoms of a disorder called Attention Deficit Hyperactivity Disorder,or ADHD.About one in 10 U.S.children has ADHD.Among the women studied,traffic and home heating were the primary sources of air pollution exposure,Perera and 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.
16.Perera and her team chose nonsmoking pregnant women all over America.
A.Right
B.Wrong
C.Not mentioned
17.The main purpose of the research was to find out how exposure to PAHs played a role in harming the subjectsphysical health.
A.Right
B.Wrong
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