单项选择题

A person's calorie requirements vary ______ his life.

A．across
B．throughout
C．over
D．within
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单项选择题
The color blue is a ______ of calmness.
A．token
B．representation
C．tone
D．expression
单项选择题
On behalf of my company, I am ______ to you and your colleagues for your generous help.
A．subjected
B．inclined
C．available
D．obliged
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