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.
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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.
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.
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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