单项选择题

Malaria is an infectious parasitic disease that can be either acute or chronic and is frequently ______.

A．repeating
B．terminal
C．debilitating
D．recurrent
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单项选择题
Do you have an afternoon ______ this week to meet the President
A．obtainable
B．available
C．visible
D．reliable
单项选择题
He ______ the job because it involved too much traveling.
A．took up
B．applied for
C．turned down
D．switched to
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