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
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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
His name was on the ______ of my tongue, but I just couldn't remember it.
A．point
B．edge
C．tip
D．top
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