About 70,000,000 Americans are trying to lose weight(减肥). That is almost 1【C1】________every 3 people in the United States. Some

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问题         About 70,000,000 Americans are trying to lose weight(减肥). That is almost 1【C1】________every 3 people in the United States. Some people eat【C2】________food and they hardly have any fat or sweets. Others do running exercise with machines, take medicines, or even have operations.【C3】________ you can see losing weight is【C4】________work, and it will also cost a lot of money. But【C5】________do so many people in the United States want to lose weight?
        Many people in the United States【C6】________about their look of the body. For many people, looking nice also means to be【C7】________Other people worry about their health as many doctors【C8】________overweight is not good.
        Most people want to find a faster and【C9】________way to take【C10】________fat, and books of this kind are very popular. These books tell people how to lose weight. Each year a lot of new books like these are 【C11】________. Each one says it can easily help people take fat away.
        Losing weight can be【C12】________Some overweight people go to health centers, like La Costa in California. Men and women【C13】________several hundred dollars a day at these health centers. People live there for one week or two,【C14】________exercise, eating different foods. Meals there may be just a little. All these【C15】________for losing weight. 【C16】________4 days on the program, one woman called Mrs. War-ren lost 5 pounds (2.27kg). At $ 400 a day, she【C17】_________ $ 320 in losing each pound. But she said she was still【C18】_________to do so.
        Health centers, books, medicines, operations, Tunning and exercise machines all【C19】_________ a lot of money. So in the United States, losing weight may mean losing【C20】_________too.
【C16】

选项 A、Before
B、In
C、After
D、At

答案C

解析 考查介词词义。before意为“在…之前”;in意为“在…以内”;after意为“在…之后”;at意为“在…时刻或地点”。根据原文,此处表示在4天之后。故本题选C。
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