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
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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
单项选择题
The best title for this selection is ______.
A．Food from Coal and Gas
B．Non-Spoiling and New Foods
C．Spacecraft Food
D．The Shortage of Food
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