单项选择题

A．contributions
B．sufferings
C．sacrifices
D．tributes
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单项选择题
A．in turnB．in exchangeC．in vainD．in debt
A．in turn
B．in exchange
C．in vain
D．in debt
单项选择题
Why are computerized systems acceptable and helpful
A．They can play games with us.
B．They can make money.
C．They can spot patterns of criminal behavior.
D．They can issue credit cards.
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