单项选择题

Influenza (travels) exactly as (fastly) as man. In oxcart days (its) progress was (slow).

A．travels
B．fastly
C．its
D．slow
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A．in caseB．in briefC．in no caseD．in fact
A．in case
B．in brief
C．in no case
D．in fact
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A．outputB．outlookC．outsideD．outdoor
A．output
B．outlook
C．outside
D．outdoor
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