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
The anti-nuclear campaigners joined hands and formed a 20 kilometer human ______.
A．chain
B．link
C．cable
D．strand
单项选择题
He is a brilliant professor but has his ______ as an administrator.
A．boundaries
B．restraints
C．confinements
D．limitations
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