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Losing Weight
Girls as young as 10 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 age of 10, nearly 32 per cent of girls felt 'too fat' and 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 1993 and 2003, reporting their findings in Tuesday's 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.
Still, a test that measured attitudes towards eating showed 10.5 per cent of survey participants were already at risk of developing an eating disorder.
'We're not talking about kids who've been prescribed a diet because they're above average weight or overweight. We're talking about children who are within a healthy weight range. And they have taken it upon themselves to diet to lose weight.' McVey said, acknowledging she found the rates disturbing. She said striking a balance between healthy weights and healthy attitudes towards food and body image is a complex task, with no easy solutions.
overweight adj. 超重的; 过重的
induce vt. 引起,导致
prescribe vt.处方;开药;嘱咐
The study showed that most of the girls______.

A.were
M.were
N.had
O.had

【参考答案】

D
解析:利用题干中的核心结构“mostofthegirls”作为线索,这样发现相关句:(第2段)Theirst......

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In an average winter, highway departments spread some ten million tons of salt to keep roads safe. The corrosive effects are well known, but for years they' re been dismissed with the argument that at around $ 25 a ton, salt is far cheaper than any alternative.Lately, economists have added up the actual costs. The Environmental Protection Agency estimates that salt-induced road damage and vehicle corrosion cost $ 3 billion a year. That does not include damage to underground cables, which adds hundreds of millions to utility bills. Nor does it reflect the cost of brine leaking into porous water pipes, threatening the water supply. Salty water leaches into roadbeds, kills evergreens and poisons streams.The various costs probably add another $ 2 billion to the national salt bill. Scientists estimate the full economic, or 'life cycle,' cost for a ton of salt at $ 500, or 20 times the $ 25 purchase price. That begins to make the switch to calcium magnesium acetate, perhaps the most promising alternative look practical. CMA, made from acetic acid and dolomitic(含白石的) lime, costs $ 600 a ton and has minimal adverse effect. Some researchers believe the cost can be halved by making CMA from waste cheese whey or pulp-mill effluent.While CMA and other alternatives are being researched, many cities and states are cutting back on their use of salt. Keeping dispensing equipment in good repair helps reduce the amount spread.Salt spread on road in winter may cause all the following problems except ______.