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.

A．successfully B．painfully C．occasionally D．immediately

A．helpless B．cheap C．useless D．beneficial

A．make up B．come across C．turn to D．get on

A．potentially B．additionally C．frequently D．definitely

A．taken from B．linked to C．held up D．based on

A．health B．diet C．cancer D．protein

A．hope B．accept C．suggest D．doubt

A．recommend B．offer C．demand D．agree