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  3. How to eat healthfully can be especially complex for working women who often have neither the desire nor the time to cook for th

How to eat healthfully can be especially complex for working women who often have neither the desire nor the time to cook for th

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问题     How to eat healthfully can be especially complex for working women who often have neither the desire nor the time to cook for themselves. Registered dietitian(营养学家)Barbara Morrissey suggests that a few simple rules can help.
    "Go for nutrient-dense foods, " she suggests, "foods that contain a multiple of nutrients. For example, select whole wheat bread as a breakfast food, rather than coffee cake. Or drink orange juice rather than orange drink, which contains only a small percentage of real juice— the rest is largely colored sugar water. You just can’t compare the value of these foods, the nutrient-dense ones are so superior, " she emphasizes.
    Morrissey believes that variety is not only the spice of life—it’s the foundation of a healthful diet. Diets which are based on only one or two foods are not only virtually impossible to sustain, they can be very harmful, she says, because nutrients aren’t supplied in sufficient amounts or balance.
    According to Morrissey, trying to find a diet that will cure your illnesses, or make you superwoman is a fruitless search. As women, many of us are too concerned with staying thin, she says, and we believe that vitamins are some kind of magic cure to replace food.
    "We need carbohydrates, protein and fat—they are like the wood in the fireplace. The vitamins and minerals are the match, the spark, for the fuel, " she explains. "We need them all, but in very different proportions. And if the fuel isn’t there, the spark is useless. "
By "if the fuel isn’t there, the spark is useless", the author means______.
选项 A、carbohydrates, protein and fat are enough to sustain a human life
B、vitamins and minerals are virtually of no value
C、carbohydrates, protein and fat are as important as vitamins and minerals
D、without carbohydrates, protein and fat, vitamins and minerals are of no use
答案D
解析 本题的关键是理解最后一段的真正意思。A和B项内容错误，C项不符合原文中的in very different proportions(比例不同)。D项的意思为：没有碳水化合物、蛋白质和脂肪(the wood in the fireplace／fuel)，维生素和矿物质(the match／spark)不起作用。
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