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  3. Drink from plastic bottles can raise the body’s levels of a controversial "gender-bending" chemical by more than two thirds, acc

Drink from plastic bottles can raise the body’s levels of a controversial "gender-bending" chemical by more than two thirds, acc

admin2013-10-17  21
问题     Drink from plastic bottles can raise the body’s levels of a controversial "gender-bending" chemical by more than two thirds, according to tests.
    Experts have been concerned about the possible health effects of bisphenol A(BPA)—an everyday chemical used in many plastic food and drink containers and tins as well as clear baby bottles—which is officially classified as toxic in some countries.
    A study found that participants who drank for a week from polycarbonate(聚碳酸酯)bottles showed a 69 percent increase in their urine(尿液)of BPA.
    Researchers did not say how much liquid was drunk per day. Researchers from Harvard School of Public Health studied 77 students, who had first undergone a seven-day "washout" phase in which they drank all cold beverages(饮料)from stainless steel bottles in order to minimise BPA exposure.
    They were then given two polycarbonate bottles and asked to drink all cold beverages from them during the next week. Previous studies have suggested that high levels of BPA consumption are linked to birth defects, growth problems and an increased risk of heart disease. In particular there are fears that heating the bottles, as parents would do when warming their baby’s milk, causes the chemical to leak in potentially dangerous quantities into the liquid contained within.
    " If you heat those bottles, as is the case with baby bottles, we would expect the levels to be considerably higher. This would be of concern since infants may be particularly susceptible to BPA’s hormone gland-disrupting(扰乱腺体激素分泌)potential. " said the senior author of the latest study, Karin B. Michels.
    Most adults carry BPA in their bodies but expert opinion on the risks is divided. The European Food Safety Authority believes that people naturally convert the chemical into less harmful substances in the body.
    Previous studies had found that BPA could leach(渗出)from polycarbonate bottles into their contents, but this study is the first to show the size of the corresponding increase in urinary BPA concentrations in humans.
    Harvard researcher Jenny Carwile said, " While previous studies have demonstrated that BPA is linked to adverse health effects, this study fills in a missing piece of the puzzle—whether or not polycarbonate plastic bottles are an important contributor to the amount of BPA in the body. "
What result can be expected if baby bottles containing polycarbonate are heated?
选项 A、The liquid in the bottles would absorb limited amount of converted BPA.
B、The infants should be seriously bothered by such disease as heart attack.
C、Babies would consume more BPA if they drink the liquid in the bottles.
D、The infants would undoubtedly refuse to drink the liquid in the bottles.
答案C
解析 推理判断题。由定位句可知，当加热用塑料瓶装的牛奶时，BPA的含量会相当高，C)与之相符，故为答案。联系前文可知，当家长给宝宝加热用塑料瓶装的牛奶时，渗透进瓶内液体中的BPA的含量并不是有限的，而且也不是经过转化的，故排除A)；前文提到…high levels of BPA consumption are linked to birth defects，growth problems and an increased risk of heart disease．但无法由此推知给宝宝加热用塑料瓶装的牛奶一定会使宝宝受到心脏病的严重困扰，故排除B)；后文…infants may be particularly susceptible to BPA’s hormone gland—disrupting potential．主要为了强调BPA可能会对宝宝造成的伤害，不能推知宝宝会不会拒绝喝加热过的塑料瓶中的牛奶，故排除D)。
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