問題詳情

Passage TwoQuestions 26 to 30 are based on the following passage.Doctors have long known that eating fish helps protect against heart disease. What they don't know is why fish are beneficial. For years they figured it was a simple question of substitution: folks who replace red meat with fish are naturally cutting down their intake of saturated (饱和的) fat. But a growing body of evidence collected over the past 30 years suggests fish contain healthful elements called omega-3 fatty acids.Omega-3 fatty acids belong to a group of compounds known as polyunsaturated fats. These fats serve as the raw material for a whole host of essential structures in the body, from brain cells to molecules (分子) that regulate blood pressure.Since our bodies cannot manufacture their own supply of omega-3s, we have to get them from the food we eat, mostly from fish but also from plant sources like soybeans (大豆).The American Heart Association has recommended that everyone eat two 85-g servings of fatty fish a week. But the A.H.A's expert panel wasn't ready to declare that taking omega-3 pills will protect your heart. It's just too easy to get more omega-3 than you need from pills, and the panel was worried that an excess could cause serious side effects, such as internal bleeding.The U.S. Food and Drug Administration, however, allowed manufactures of omega-3 pills and fish oils to advertise the fat's benefits-as long as the label does not suggest taking more than two grams per day.One thing is clear whether you get your omega-3s from pills, oils or fish: they are not cure-alls. You still have to eat a well-balanced diet that's lower in total fat than most Americans currently consume. Otherwise, you're fishing for trouble.
26. Doctors have long been puzzled by .
(A)why red meat is harmful
(B)how beneficial fish are
(C)what makes fish healthful
(D)how red meat is replaced

參考答案

答案：C
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)

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