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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What can one use when one wants to buy stamps in some post offices One can use（）
单项选择题
How much does one ticket cost（）

A．$ 1.40.
B．$ 6.40.
C．$ 4.30.
D．$ 8.60.
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