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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.  
【C16】
选项 A、additional
B、central
C、obvious
D、cautious
答案B
解析 纵观整篇文章，首段、第5段和第6段空格所在句都提到这个观点，即更健康的饮食每天需多花大约1．50美元，第3段说这些观点是在分析了来自10个高收入国家的27项调查研究中关于健康与不健康食品成分和饮食的价格差异后得出的，据此可推断这个观点是该调查主要的发现，故选B项central“主要的”。A项additional“额外的”，往往表示“次要的”，若是次要的，就不会有那么多段落提到这个观点，故排除。这个发现是经过研究人员大量的调查研究、分析对比后得出的，所以不能选C项obvious“显而易见的”。D项cautious通常用于形容人“小心谨慎的”，不用于形容事物。
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