单项选择题

You may get some infectious diseases _______.

A．when arriving in Hong Kong
B．before you understand them
C．within 2 weeks of your arrival in Hong Kong
D．before arriving in Hong Kong
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单项选择题
Researchers in the United States carried out the study with the help of _______.
A．young people
B．some old people
C．men doctors
D．woman doctors
单项选择题
From this passage, we learn that aspirin is usually used to treat _______.
A．heart attacks
B．older men
C．older women
D．other disease
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