填空题

Why do people want to use postcards
Because they are（）

【参考答案】

cheaper than letters
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单项选择题
Where does this conversation probably take place.（）

A．Airport.
B．Post Office.
C．Train Station.
D．Bus Station.
单项选择题
Suppose there were a flood or an earthquake and the people could not be reached by trains or trucks.（）packages of food could be dropped from planes, the people might starve.

A. Until
B. Before
C. Unless
D. If only
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