Question

【题目】The high-protein, low-carbohydrate (碳水化合物) diets many people turn to for weight loss might have potentially harmful long-term effects on the colon, a small study indicates.

In the study, UK researchers found that a protein-heavy, low-carb diet created certain changes in the colon that could contribute to colon cancer risk The study itself does not show whether high-protein diets really raise the risk of any colon diseases, but the findings raise that possibility.

Diets relatively high in protein and lower in carbs have been shown to help heavy people lose weight. "People should not be discouraged from losing weight," Dr Flint said. However, he added, they should make sure that any weight loss plan includes adequate amounts of fiber and a high protein intake over months to years might have ill effects on the colon.

The findings are based on 17 overweight men who followed three short-term diets: a one-week menu plan to keep their weight; a four-week high-protein diet with reasonable amounts of carbohydrates; and a four-week high-protein diet low in carbs.

On average, the study found when the men were on the high-protein diets, they had higher levels of substances known as N-nitroso compounds (亚硝基化合物) and other metabolites (代谢物) that have been linked to cancer. And when they were on the high-protein, low-carb diet, they had lowered amounts of fiber-originated compounds thought to be protective against cancer.

Exactly what those changes might mean for a person's health is not clear. But Flint said that the findings suggest that people should be cautious about consuming too much protein and too little fiber over a long period. In general, experts recommend 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.

【1】 What is the best title of the text?

A Plan a Healthy Diet

B. Take Care of Your Colon

C. How to Lose Weight

D. How to Protect against Cancer

【2】 The underlined word "colon" in Paragraph 1 probably refers to "_____".

A. an organ

B. intelligence

C. a habit

D. behaviour

【3】 The study shows that high-protein, low-carb diets may _____.

A. affect your mood

B. lower cancer risks

C. harm your body

D. keep your figure

【4】 It can be inferred from the text that _____.

A. we shouldn't take the study seriously

B. weight problems are hard to solve

C. it is better to follow a low-carb diet

D. people should be cautious to lose weight

【5】 The author is intended to _____.

A. advise how to lose weight

B. introduce a scientific finding

C. describe a research process

D. talk about healthy diets

Answer 1

【答案】【1】B

【2】A

【3】C

【4】D

【5】B

【解析】【1】主旨大意题。文章的第一段是本文的中心端，概括了本文的主要内容，故B项作为本文的标题最合适。

【2】词义猜测题。由第二段第一句中的colon cancer可推知colon是一种器官，故选A。

【3】细节理解题。根据文章第二段的第一句可知，英国调查人员发现，高蛋白低碳水化合物的饮食结构会使结肠发生某些变化，而这种变化将增加患结肠癌的风险。

【4】推理判断题。根据文章最后一段可知，人们在减肥时应谨慎，因为长期大量摄入蛋白质、少量碳水化合物对身体不好，故D项正确。

【5】作者意图题。根据第一段内容可知作者是在向读者介绍一项科研结果。故选B。