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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.
【C20】
选项 A、drives
B、reaches
C、breaks
D、turns
答案A
解析 空格处需要填一个动词与down搭配来表示使价格下降。分析这四个选项：[B]reaches“到达，达到，伸出”不与down搭配，常与out，for连用，意为“伸出，伸手去够”，因此[B]不对：[C]breaks“打破，违犯”，break down的意思是“毁坏；使健康、精神崩溃”，放在此处显然不合适，可以排除；[D]turns“(使)转动，翻转”，turn down“降低，减弱音量或热度”，因此也不符合题意要求；[A]drives“开车，驱赶，推动”，指催促迫使进入或离开某特定状态，这里可指“食物的价格下跌”。因此[A]drives放在此句中最为贴切，是答案。
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