单项选择题

Depression remains one of the most______ health disorders in the US.

A．prospective
B．prevalent
C．provocative
D．perpetual
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单项选择题
At first, the______ of color pictures over a long distance seemed impossible, but, with painstaking efforts and at great expense, it became a reality.
A．transaction
B．transmission
C．transformation
D．transition
单项选择题
After earthquake many local firms______ to disaster relief efforts.
A．administered
B．distributed
C．attributed
D．contributed
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