单项选择题

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

A．attention
B．attraction
C．settlement
D．arrangement
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单项选择题
After the meeting, the leaders had a ______ discussion about it.
A．far
B．farther
C．further
D．farthest
单项选择题
There have been great advances in the ______ of cancer.
A．process
B．treatment
C．instruction
D．influence
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