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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We should have a(n) ______ medical examination at least once a year.
A. accurate
B. actual
C. chief
D. thorough
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Don't respond to any e-mails ______ personal information, no matter how official they look.
A. searching
B. asking
C. requesting
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