单项选择题

He has a ( ) habit of biting his lips when he is puzzled.

A．particular
B．specific
C．peculiar
D．general
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A man who wants to start a business must have some ( ) .
A．currency
B．income
C．wealth
D．capital
单项选择题
Great ( ) the difficulties are, we must do our best to succeed.
A．while
B．as
C．although
D．however
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