单项选择题

This passage tells us about ______.

A．an accident in a river
B．a sea captain
C．a boat crossing a river full of ice
D．a noble deed by a brave man
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单项选择题
One solution to the world's food shortage problem could be found in ______.
A．foods from non-food materials
B．foods in plastic tubes
C．freeze-dried foods
D．eatable food packages
单项选择题
Freeze-dried foods ______.
A．always contain meat
B．need refrigeration
C．are dried and then frozen
D．last for a long time unspoiled
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