单项选择题

The salesman's ______ annoyed the old lady, but finally she gave up.

A．endurance
B．assistance
C．persistence
D．resistance
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单项选择题
Air is composed of______ gas including hydrogen, oxygen and carbon dioxide.
A．varied
B．variant
C．variable
D．various
单项选择题
John was young, ______, he was equal to this important task.
A．therefore
B．moreover
C．nevertheless
D．hence
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