单项选择题

Mercury is the nearest planet to the sun and its period of ______ is 88 days.

A. movement
B. evolution
C. return
D. revolution
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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
单项选择题
A loan refers to anything given on condition of its return or repayment of its ______.
A. excess
B. debt
C. currency
D. equivalent
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