单项选择题

This notice is to _______.

A．all citizens in Hong Kong
B．all persons going to Hong Kong from Kowloon
C．all who travel to Hong Kong
D．all people exposed to diseases
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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
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
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