题目内容
Great as Newton was, many of his ideas _____today and are being modified by the work of scientists of our time.
A.are to challenge | B.may be challenged | C.have been challenged | D.are challenged |
C
解析
Overweight has been a great concern for some people. In an attempt to keep normal weight, people have 48 tried various methods. Nevertheless, not all the ways are 49 when it comes to health. For weight loss, many people 50 the high-protein, low-carbohydrate(碳水化合物)diets. However, such diets might have 51 harmful long-term effects on the colon (结肠), a small study indicates.
On average, the study found when the men were on the high-protein diets, they had higher levels of substances known as N-nitrous compounds that have been 52 cancer. And when they were on the high-protein, low-carbohydrate diet, they had lowered amounts of fiber-originated compounds thought to be protective against 53 .
The findings 54 that people should be aware of consuming too much protein and too little fiber over a long period. In general, experts 55 that adults get about 28 grams of fiber per day though—it’s not known whether that’s enough for someone on a high-protein weight-loss diet.
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