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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单项选择题
When the manager went to Canada on business, his () took over all his duties.

A．caretaker
B．officer
C．deputy
D．commander
单项选择题
Mathematics () the study or science of numbers.

A．is
B．are
C．was
D．were
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