There are three to four times as many fast璮ood restaurants within less thanwal a mile of schools than they would be expected.

　　Most public and private schools in Chicago are only a five璽o?0璵inute walk from at least one fast璮ood restaurant. The city is facing the same problem like other areas. Children andstau teens are surrounded by unhealthy options.

　　Students can pick up fast foods, including hamburgers, French fries, fried chicken and doughnuts, on the way to and from school. Some high school students can go off campus at lunchtime to eat it. “Five days a week we send children to an environment where there's an abundance of high­calorie, low­nutritional­quality, inexpensive food，” says Bryn Austin.

　　The research comes from growing concerns that American schoolchildren are gaining weight. About 31% of kids aged 6 to 19 are overweight or at risk of becoming so. On days when kids eat fast food, they have more calories, more fat, more sugar and fewer fruits and vegetables than on other days.

　　Kelly Brownell from Yale University said, “Just like there are drug­free zones around schools, there should be zones around schools that are free of junk food, including fast­food restaurants, mini­markets and gas stations that sell food inside.”

　　41. The passage mainly wants to show that ________.

　　A. the number of fast­food restaurants is increasing

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