单项选择题

Which of the following should not be used when trying to escape a fire

A．windows.
B．elevators.
C．fire escapes.
D．stairways.
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单项选择题
How far is the second floor window from the ground
A．About 12 feet.
B．About 6 feet.
C．About the height of an average man.
D．Nearly 10 feet.
单项选择题
Panama was a Spanish colony ______.
A．from the 16th century to the 18th century
B．until 1903
C．for about 200 years
D．for 300 years and more
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