根据实际情况回答问题。

1. What's your name?

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2. When do you go to school?

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3. When do you have math class?

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4. When do you eat dinner?

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5. Do you go to bed at 9: 00?

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6. How many pencils do you have?

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食物中毒发病潜伏期短，发病曲线呈（）趋势。