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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

admin2014-05-30  42
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 do we know about bisphenol A(BPA) from the beginning of the passage?
选项 A、It is certain substance taken in by human beings every day.
B、It is a component contained in a number of plastic products.
C、It is an element that plays a decisive role in people’s gender.
D、It is a kind of chemical that is universally regarded poisonous.
答案B
解析 事实细节题。由定位句可知，BPA是很多食品和饮料的塑料包装盒、易拉罐以及透明奶瓶中所含的常规化学成分，由此可知大量塑料制品中都含有BPA，故B)为答案。尽管很多塑料制品中都含有BPA，但不能由此推断人们每天都会摄取这种物质，故排除A)；联系上下文可知，前文中的a controversial“genderbending”chemical指的就是BPA，但原文只说明了这种物质可能会引起“性别偏移”，并不能决定人的性别，故排除C)；由后文which is officially classified as toxic in some countries可知，并不是所有国家都将BPA列为了有毒物质，故排除D)。
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