单项选择题

A．Skiing.
B．Skating.
C．Swimming.
D．Jogging.
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Streets and buildings are numbered sequentially in _____________.
单项选择题
A．More work as an instructor.B．A higher salary.C．A longer vacation period.D．A research assignment.
A．More work as an instructor.
B．A higher salary.
C．A longer vacation period.
D．A research assignment.
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