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【参考答案】

maintaining healthy teeth
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单项选择题
Which of the following ways can help people prevent from bacteria
A．Smell and have a careful look at the food.
B．Only eat the food stored in refrigerator.
C．Ensure the food is totally heated before eating.
D．Eat the food before they are thawed.
单项选择题
The word met in Paragraph Three, Line Two probably refers to
A．see
B．discover
C．reach
D．act
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