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  3. Eating healthily costs about $1.50 more per person daily, according to the most thorough review yet of the affordability of a he

Eating healthily costs about $1.50 more per person daily, according to the most thorough review yet of the affordability of a he

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问题     Eating healthily costs about $1.50 more per person daily, according to the most thorough review yet of the affordability of a healthy diet.
    "For many low-income families, an【C1】________$1.50 daily is quite a lot," says Mayuree Rao, "It【C2】________to about $550 more per year per person, and that could be a real【C3】________to healthy eating."
    Rao and her colleagues reached their【C4】________after analysing 27 studies from 10 high-income countries, comparing price【C5】________for healthy versus unhealthy ingredients and diets.【C6】________one study compared the cost of a diet rich in fruit and vegetables versus one that was【C7】________in them. Another compared prices of【C8】________healthy and less healthy items, such as wholegrain versus white bread.
    Individual items were【C9】________matched in price. Meats【C10】________the largest difference: healthier options cost an average of 29 cents per serving more than unhealthy options.
    【C11】________this, comparisons of whole diets showed that healthier diets cost averagely $1.48 more per day.
    This shows that comparisons based on single ingredients don’t tell the full【C12】________. "It tells us that,【C13】________, it doesn’t cost more to eat healthier based on one nutrient," says Rao. "But there’s growing evidence that the【C14】________of foods in your diet【C15】________your disease risk more than any single nutrient, so we think our【C16】________finding that healthier diets cost about $1.50 more has the most public health【C17】________."
    As to why healthier food has become more【C18】________Rao says that it may be because the food industry organizes itself and the types of food it produces to【C19】________its own economies of scale,【C20】________than what’s best for consumers.  
【C15】
选项 A、imposes
B、imparts
C、impacts
D、impairs
答案C
解析 上文已经提到了健康和不健康的食物成分和饮食，该比较句的主语是“饮食中的食物(成分)”，宾语是“疾病风险”，推断这些食物成分会对人的身体健康产生影响，所以空格处选择C项impacts“影响”。A项imposes“把……强加于”，常用于impose sth．on sb．。从用法上即可排除。B项imparts“给予”，常用于impart sth．to sb．，也可从用法上排除。D项impairs“损害”代入空格，表示“损害疾病风险”，语义不通顺。
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