单项选择题

According to the author, if you want to keep healthy, you had better ______.

A．make the room dry
B．keep the food in the refrigerator
C．wash your hands as much as possible
D．clean the surfaces with anti-bacterial products
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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
单项选择题
We can infer from Paragraph 3 that ______.
A．healthy people should live separately from unhealthy members of the family
B．a germ-free home is not only possible, but significant
C．unless you live with the vulnerable, it is pointless to sterilize the air
D, our immune systems are too weak to fight against the food poisoning bacteria
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