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

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单项选择题
All don''t have a free ticket must pay the admission fee（）.

A．Everyone who doesn't have a free ticket
B．No one who doesn't have a free ticket
C．No one who has free tickets
D．Anyone who has free tickets
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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