单项选择题

A ______ is a very infectious disease that spreads quickly and kills large numbers of people.

A．plague
B．outbreak
C．pledge
D．nightmare
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单项选择题
Economics and politics are best studied together as the two subjects ______.
A．overlap
B．slash
C．flap
D．slap
单项选择题
I broke Mary's pen by accident, and in ______ she tore up my school work.
A．retreat
B．reverse
C．revenue
D．revenge
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