单项选择题

Mathematics ______ the study or science of numbers.

A．is
B．are
C．was
D．were
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单项选择题
Measles ______ a long time to get over.
A．spend
B．spends
C．take
D．takes
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
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