单项选择题

______ fun and good exercise, swimming is a very usefull skill.

A．Beside
B．Besides
C．Except
D．Except for
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单项选择题
But from the start of their experiments, the Wright brothers found that they needed money to pay _______ their research.
A．back
B．down
C．for
D．off
单项选择题
There were no tickets ______ for Sunday's performance.
A．possible
B．probable
C．available
D．feasible
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