单项选择题

In the first sentence of Paragraph 4," . manage this" means "to manage the process of ______ "

A．killing the bacteria in your body
B．multiplying to a significantly large number
C．raising the room temperature
D．sterilizing the perishable food

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单项选择题The word bug used in Paragraph 5 means ______.

单项选择题According to the author, if you want to keep healthy, you had better ______.