单项选择题

A．The epidemic of AIDS.
B．The treatment of AIDS.
C．The transmission of AIDS.
D．The impact of AIDS.
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填空题
It is essential that electricity be produced at just the right______to be compatible with a utility grid.
单项选择题
A．2.B．3.C．6.D．9.
A．2.
B．3.
C．6.
D．9.
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