单项选择题

Niagara Falls is a great tourist ______ drawing millions of visitors every year.

A．attention
B．attraction
C．appointment
D．arrangement
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单项选择题
She cooked the meat for a long time so as to make it ______ enough to eat.
A．mild
B．slight
C．light
D．tender
单项选择题
They are going to have the serviceman ______ an electric fan in the office tomorrow.
A．install
B．to install
C．to be installed
D．installed
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