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下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题，从4个选项中选择1个最佳答案涂在答题卡相应的位置上。 第1篇 Losing Weight Girls as young as 1 0 years old are dieting and in danger of developing unhealthy attitudes about weight，body image and food，a group of Toronto researchers reported Tuesday. Their study of 2,279 girls aged 10 to 14 showed that while the vast majority had healthy weights，nearly a third felt they were overweight and were trying to lose pounds.Even at the tender agez of 10，nearly 32 per cent of girls felttoo fatand 31 per cent said they were trying to diet. McVey，a researcher at.the Hospital for Sick Children in Toronto，and her colleagues analyzed data collected in a number of surveys of southern Ontario school girls between 1 993 and 2003，reporting their findings in Tuesdays issue of the Canadian Medical Association Journal. Nearly 80 per cent of the girls had a healthy body weight and only 7.2 per cent were considered overweight using standard weight-to.height ratios.Most researchers suggest the rate of overweight children in this country is several times higher than that figure. Nearly 30 per cent of the girls reported they Were currently trying to lose weight，though few admitted to dangerous behavior such as self-induced vomiting. | 
