单项选择题

Unlike the common cold, flu tends to start abruptly.

A. mysteriously
B. seasonally
C. repeatedly
D. suddenly
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单项选择题
The criminal gave us a long chase before we caught him.
A. trial

B. pursing
C. pursuit

D. running
单项选择题
The land crab a forest-floor scavenger native to tropical America, migrates to the water to breed.
A. die
B. swim
C. mate
D. hatch
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