单项选择题

The disease has completely ______ in this country.

A．died out
B．died down
C．died away
D．died off
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单项选择题
Smoking is a very bad habit, which many people find difficult to ______.
A．break
B．beat
C．breathe
D．cough
单项选择题
Mathematics ______ the study or science of numbers.
A．is
B．are
C．was
D．were
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