单项选择题

A．A flight to Los Angeles.
B．A book written by a doctor.
C．A disease on the comeback and its reasons.
D．Man’s effort to control disease.
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单项选择题
A．The key source of connections.B．The time spent with others.C．The kind of social contact.D．The degree of solitude.
A．The key source of connections.
B．The time spent with others.
C．The kind of social contact.
D．The degree of solitude.
单项选择题
A．Chinese students.B．Indian students.C．Light-skinned students.D．Dark-skinned students.
A．Chinese students.
B．Indian students.
C．Light-skinned students.
D．Dark-skinned students.
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