单项选择题

The loyalty of dogs to their masters has earned ______"man's best friend."

A．the nickname of
B．them the nickname
C．a nickname
D．nicknames
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单项选择题
______ the passage of light, many new plastics are processed using technologies rivaling those used in the manufacture of computer chips.
A．For the better of
B．Permitting better
C．To better permit
D．It is better for
单项选择题
If drug abuse, prostitution, pollution, environmental decay, social inequality, and the like ______, more is required than an increased police presence or a fresh coat of paint.
A．are to eliminate
B．are eliminated
C．are to be eliminated
D．are being eliminated
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