单项选择题

A book emphasizes AIDS （） a disease, not a social problem, and discusses how it can be prevented.

A．for
B．on
C．with
D．as

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单项选择题

Drunkenness was as much of an （） to enlightenment(启蒙) as lack of education.

A．obstacle
B．attack
C．insult
D．indifference

单项选择题

The mechanic used to （） and oil the machine all the time.

A．polish
B．take
C．design
D．lay

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