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
People who walk on the grass are ______to a fine of $5.
A．possible
B．liable
C．likely
D．reliable
单项选择题
When I try to understand _____that prevents so many Americans from being as happy as one might expect, it seems to me that there are two causes.
A．why it does
B．what it does
C．what it is
D．why it is
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