The average American leaves home between the ages of 18 and 20. In 1970, 10% of these people moved back with their parents after leaving home. Today, the number has risen to sixty<br>.

The average American leaves home between the ages of 18 and 20. In 1970, 10% of these people moved back with their parents after leaving home. Today, the number has risen to sixty
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出自：北京开放大学大学英语（2)

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