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For some people， the negative influence of rapid pace of life is that it can result in highblood pressure and stomach ulcers.
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按测度水平，变量可分为哪几类？举例说明。

If American students do not hand in their assignments before the deadline， they willface the risk of getting low or even no grades for their work.
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If you are going to be more than a few minutes late for an appointment in America， youshould call your friend to inform. him of your lateness.
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