单项选择题

I think I'll take a week ______ . I need a holiday.

A．up
B．on
C．out
D．off
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单项选择题
The speed at which an animal lives is determined by ______ the rate at which it uses oxygen.
A．measuring
B．assessing
C．surveying
D．pleasing
单项选择题
Ralph and his companions would explore the woods on the estate for days on ______.
A．show
B．time
C．end
D．hand
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