单项选择题

A great deal has been done to remedy the situation（）

A．maintain
B．improve
C．preserve
D．protect

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单项选择题
In Britain and many other countries appraisal is now a tool of management-（）

A．evaluation
B．production
C．efficiency
D．publicity
单项选择题
It is a complicated problem．（）

A．strange
B．complex
C．difficult
D．unusual
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