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  3. Including a few bites of meat in the diets of poor children from developing countries improves both their health and their perfo

Including a few bites of meat in the diets of poor children from developing countries improves both their health and their perfo

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问题     Including a few bites of meat in the diets of poor children from developing countries improves both their health and their performance in mental tests, according to reports presented at this year’s annual meeting of the American Association for the Advancement of Science.
    In one study from rural Kenya,【C1】______found that children who ate【C2】______ounces of meat every day, along with their lunch of corn and beans,【C3】______better in problem-solving tests【C4】______children given supplements of milk or vegetable oil. This small【C5】______of meat gave children all their daily needs【C6】______vitamin B12, 68 percent of all they needed of zinc, and 26 percent of their daily iron【C7】______, the researchers noted.
    Dr. Howarth Bouis of the International Food Policy Research Institute in Washington D. C, told Reuters Health that research【C8】______children who don’t get enough iron, zinc and other【C9】______have a weakened immune system,【C10】______growth and cognitive impairments. And when entire generations of children aren’t getting enough nutrients,【C11】______can have implications nationwide, Bouis added.【C12】______, the World Bank estimates that micronutrient deficiencies【C13】______South Asia 5 percent of its GDP each year, he said. "When you can’t work【C14】______hard, you can’t think as well. It【C15】______from economic development, " Bouis said.
    He added that children in【C16】______countries don’t get enough nutrients【C17】______they can’t afford them, so it’s up to the government to【C18】______. For instance, the government could【C19】______programs that increase production of nutrient-rich foods, which【C20】______down the price, Bouis suggested.
【C4】
选项 A、as
B、than
C、so
D、thus
答案B
解析 由空格所在句子中的better可以判定此句是一个比较级结构的句子，两个比较的对象分别是children who ate usual ounces of meat和children given supplements of milk or vegetable oil，通过调查研究表明前者比后者解决问题的能力更强。由语法规则可知形容词或副词的比较级应与than连用。显然[B]than是答案。其余几个[A]as、[C]so、[D]thus都不与比较级搭配，因此可以排除。
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