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					What has prevented the passing of work-family balance laws in the United States? 出自-2010年6月阅读原文
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					The 1976 copy right act has not prevented these abuses fully, but it has clarified the legal rights of the injured parties and given them an avenue for remedy. 出自-2014年6月听力原文
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					Many cancer cases could be prevented. 出自-2010年12月听力原文
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					The WCRF has estimated that 19,000 cancers a year in Britain could be prevented if people lost their excess weight with growing evidence that excess body fat increases the risk of various cancers 出自-2010年12月听力原文