大學(xué)英語聽力四級練習(xí)材料

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    To Juice or Not to Juice?
    Nutrition
    Juice may be tasty, but it’s not really that nutritious. While orange juice is an excellent source of vitamin, it doesn’t contain a significant amount of other minerals and vitamins. What’s more, excessive juice consumption can cause all kinds of problems. This is especially troubling when you keep in mind that children are the ones drinking most of the juice in this country.
    You see, when you drink juice, you’re getting mainly water and carbohydrates. And if you drink too much, the high carbohydrate content can cause gas, bloating, and diarrhea. Plus, juice has as many calories as soda, and, like soda, has been linked to the obesity epidemic raging in our country.
    Milking The Problem
    Also, for children, juice often crowds out milk because it tastes better. Children who don’t drink enough milk are more likely to suffer from calcium and vitamin D deficiencies. In fact, in some parts of the country, rickets, which is caused by vitamin D deficiency, is on the rise. Finally, keeping a juice bottle in your mouth for a long time can promote tooth decay.
    The key to juice intake is moderation. The American Academy of Pediatrics suggests that children under six should not drink more than six ounces of juice a day, and that older children shouldn’t drink more than twelve ounces. All children should be encouraged to go straight to the source and eat whole fruit, which contains more nutrients than juice, plus other good stuff, like fiber.
    果汁該喝還是不該喝?
    營養(yǎng)
    果汁也許好喝,但并不怎么營養(yǎng)。橙汁富含維生素,而其他礦物質(zhì)和維生素含量很少。再者,過度飲用果汁會造成各種問題。當(dāng)你意識到在這個國家,兒童是果汁的主要消費(fèi)群體時,尤為擔(dān)心。
    你要知道,當(dāng)飲用果汁時,你攝入的主要是水和碳水化合物。如果喝得太多,碳水化合物就會產(chǎn)生氣體,引發(fā)胃脹和腹瀉。另外,果汁的卡路里含量同蘇打水一樣多,而且,跟蘇打水一樣,它與我國肥胖癥人數(shù)激增有關(guān)。
    喝奶難題
    對于兒童來說,選擇果汁而不是牛奶,因?yàn)榍罢呖诟懈谩ED虜z取不足的兒童,更容易缺鈣和維生素D。事實(shí)上,在我國的一些地區(qū),由于缺乏維生素D,患佝僂病的人數(shù)正在上升。最后,長期果汁不離口的人會增加齵齒的風(fēng)險。
    喝果汁的關(guān)鍵是要適量。美國兒科學(xué)會建議,六歲以下兒童一天的果汁飲用量不應(yīng)超過六盎司,年長一點(diǎn)的兒童不應(yīng)超過十二盎司。應(yīng)鼓勵所有的兒童直接食用水果,水果的營養(yǎng)比果汁豐富,并且還含有其它對身體有益的物質(zhì) ,比如,纖維。