单项选择题

The most (distinctive) change in American (values) of the last twenty years (has been) an increasing emphasis (in) the pursuit of self-fulfillment.

A．distinctive
B．values
C．has been
D．in
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单项选择题
______ being fun and good exercise, swimming is a very useful skill.
A．Rather than
B．Apart from
C．Instead of
D．Owing to
单项选择题
The contract is ______ unless it is officially stamped.
A．invalid
B．invaluable
C．precious
D．deliberate
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