单项选择题

An ______ runner can run 2 miles in fifteen minutes.

A．common
B．usual
C．average
D．general
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单项选择题
The National Geographic Society headquarters, ______ in Washington, DC, is well-known for its magazine.
A．situated
B．placed
C．stood
D．positioned
单项选择题
The secretary identified ______ reports treated new issues as well as old ones.
A．those
B．which
C．that
D．both
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