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  3. A new study says many young people in the United States take substances that

A new study says many young people in the United States take substances that

游客2024-02-08  44
问题     A new study says many young people in the United States take substances that are claimed to make people【B1】______sports better. The study says that about one million Americans between the ages of 12 and 17 have used these sports supplements.
    Those who【B2】______what sports supplements they used identified creatine(肌酸) as the most【B3】______. The body produces creatine【B4】______. Some famous American【B5】______use products with creatine to increase the【B6】______of their muscles. In the United States, the substance is sold【B7】______in candy and other foods.
    However, creatine has also been linked to health problems. One doctor said that the substance causes【B8】______pain. He said it also has been linked to muscle injury and kidney problems.
    A trade group for supplement makers said it believes that creatine is safe, when it is taken by someone responsible. The trade group says there is a large amount of evidence that shows creatine is helpful for healthy people.
    Seventy percent of the young people questioned in the study could not identify any harmful effects that might【B9】______using sports supplements. Yet 96 percent of them believed that people who use the supplements face the possibility of some health damage.
    The researchers urged American parents and teachers to【B10】______children about the issue. They also urged the government to take action to limit the marketing and sales of supplements to young people. [br] 【B4】
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答案 naturally
解析 naturally。分析句子结构可知，句子中不缺少主要成分，由此可知，所填词应为副词，修饰动词produces。naturally意为“自然地”。
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