单项选择题

The United States court system is characterized by ______ hierarchies: there are both state and federal courts.

A．double
B．complex
C．simple
D．dual
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单项选择题
Difficult as it is, English study is in the long run ______ to a learner in his or her career development.
A．advantageous
B．rewarding
C．profitable
D．earning
单项选择题
People's confidence in Blair was greatly ______ by his wife's misbehavior.
A．sapped
B．cherished
C．sabotaged
D．confirmed
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