单项选择题

A．We are busier.
B．There are fewer social activities.
C．More people like living alone.
D．People are becoming more isolated.
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单项选择题
A．Paging companies.B．Television and radio broadcasts.C．Computer users.D．Household equipment.
A．Paging companies.
B．Television and radio broadcasts.
C．Computer users.
D．Household equipment.
单项选择题
A．A disease can die, but never come back.B．Cholera is a disease that doesn’t cause infections.C．A comeback disease is only restricted in one area.D．The comeback of a disease is due to a combination of many factors,
A．A disease can die, but never come back.
B．Cholera is a disease that doesn’t cause infections.
C．A comeback disease is only restricted in one area.
D．The comeback of a disease is due to a combination of many factors,
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