单项选择题

A．Less than 6,000 feet above sea level.
B．Less than 1,800 feet above sea level.
C．More than 6,000 feet above sea level.
D．More than 1,800 feet above sea level.
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单项选择题
A．In Asia.B．In America.C．In Europe.D．In Afric
A．In Asia.
B．In America.
C．In Europe.
D．In Afric
单项选择题
A．adultsB．young childrenC．adults around 18D．children of 10 upwards
A．adults
B．young children
C．adults around 18
D．children of 10 upwards
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