单项选择题

Always use a sun-tan cream to protect your skin against the harmful effect of the sun's ______.

A．beams
B．rays
C．light
D．shine
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单项选择题
He is a brilliant professor but has his ______ as an administrator.
A．boundaries
B．restraints
C．confinements
D．limitations
单项选择题
Many hunting and gathering people of the late 20th century have recently adopted some form of organized agriculture to ______ their wild food resources.
A．compliment
B．implement
C．supply
D．supplement
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