单项选择题

A) position C) contacts
B) association D) contract

A．position
B．association
C．contacts
D．contract
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单项选择题
A) in C) on B) at D) for
A．in
B．at
C．on
D．for
单项选择题
A) similar C) differential B) identical D) diverse
A．similar
B．identical
C．differential
D．diverse
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