单项选择题

This is a new model of ______ typewriter especially designed to meet the needs of traveling businessmen.

A．flexible
B．mobile
C．portable
D．active
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单项选择题
When the ______ is complete it will be at least two weeks before you receive your copy of the contract.
A．transition
B．transaction
C．transformation
D．transplantation
单项选择题
Doctors say that the disease is most ______ in the first twenty-four hours.
A．ingenious
B．infectious
C．incompatible
D．instantaneous
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