单项选择题

Though this apparatus is expensive, the patient agreed to use it after the operation because it could ______ the pain.

A．assess
B．alleviate
C．avenge
D．affirm
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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
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
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