美国科学60秒 SSS 2015-04-06_在线英语听力室_免费在线英语听力学习网站

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A small but growing market exists on the internet for human breast milk. Now a study finds that buyers should really be aware: some purveyors(供货商) of breast milk appeared to be adulterating(掺加) their product with cow’s milk.

Such bovine¹(牛的) contamination is more than just scam(欺骗). It can be a health risk for infants who are allergic² to or intolerant of cow’s milk. The study, the first to document this milk fraud, is in the journal Pediatrics.

Researchers purchased 102 samples of supposed human breast milk online. Tests found that 10 of these samples had enough bovine DNA³ to indicate that at least 10% of the milk in the sample actually came from cows.

Human milk is an ideal source of nutrients⁴ for infants, when it’s safe. Prior studies on breast milk purchased online have revealed dangerous amounts of bacteria growth that make it unsuitable for infant consumption. Since no one typically screens these internet sold milk products, for pathogens or other contaminations, it’s up to consumers to protect themselves. Some human milk banks do voluntarily screen their products, so it’s best to check with local departments of health to find safe products.

Dina Fine Maron.

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收听单词发音

1 bovine
adj.牛的；n.牛
参考例句：
He threw off his pack and went into the rush-grass andand munching,like some bovine creature.他丢开包袱，爬到灯心草丛里，像牛似的大咬大嚼起来。 He was a gentle,rather bovine man.他是一位文雅而反应迟钝的人。

2 allergic
adj.过敏的，变态的
参考例句：
Alice is allergic to the fur of cats.艾丽斯对猫的皮毛过敏。 Many people are allergic to airborne pollutants such as pollen.许多人对空气传播的污染物过敏，比如花粉。

3 DNA
(缩)deoxyribonucleic acid 脱氧核糖核酸
参考例句：
DNA is stored in the nucleus of a cell.脱氧核糖核酸储存于细胞的细胞核里。 Gene mutations are alterations in the DNA code.基因突变是指DNA密码的改变。

4 nutrients
n.（食品或化学品）营养物，营养品( nutrient的名词复数 )
参考例句：
a lack of essential nutrients 基本营养的缺乏 Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。来自《简明英汉词典》