单项选择题

Although the social sciences different a great deal from one another, they share a common interest in human relationship（）.

A．move
B．differ
C．change
D．varies

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单项选择题
All root vegetables grow underground, and not all vegetables that grow underground are roots（）.

A．but
B．or
C．as
D．thus
单项选择题
A promising note is a written agreement to pay a certain sum of money at some time future（）.

A．time futures
B．futures
C．futures time
D．future time
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