单项选择题

These animals (migrate) south annually in search of food.（）

A．explore
B．travel
C．inhabit
D．prefer

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单项选择题
It seemed (incredible) that he had been there a week already.（）

A．right
B．unbelievable
C．obvious
D．unclear
单项选择题
The rules are to (rigid) to allow for human error.（）

A．general
B．complex
C．direct
D．inflexible
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