单项选择题

It can be inferred that Scott was a hero because ______.

A．he was a sea captain
B．he crossed a river full of ice
C．he saved the boat almost at the price of his life
D．he saved many people with a tugboat
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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
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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