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
Mathematics ______ the study or science of numbers.
A．is
B．are
C．was
D．were
单项选择题
______ ,this book will sell like not cakes.
A．Once printed
B．Printed
C．Having printed once
D．After to print
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