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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.  
【C13】
选项 A、on occasion
B、in detail
C、on average
D、in addition
答案C
解析 第4段第2句提到，即便价格差别最大的食物成分——肉类平均价格也仅相差29美分，即单一食品的平均价格差距很小。空格所在句用It tells us that对前面的比较进行总结，据此可推断该空选择C项on average“平均来说”，与第4段第2句的an average of相呼应。A项on occasion“偶尔”表示偶发现象，不能代表文章所分析的价格差异的整体情况，应排除。B项，in detail表示“详细地”，通常作状语修饰谓语动词，不能作插入语。D项in addition“另外”，通常引出递进关系的句子，相当于furthermore，该句是直接引语，与上一句并不构成递进关系，亦排除。
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