单项选择题

Vacuum packing is to ______.

A．immerse food in very hot or boiling water
B．sterilize food
C．remove air from the cans
D．subject food to steam or boiling water
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单项选择题
According to the author it is not desirable to ______ by traveling on foot.
A．lose the kind of experience
B．enjoy the present as a reality
C．have a sound and satisfying sleep
D．become physically tired
单项选择题
Travelling at high speed means ______.
A．people' s focus on the future
B．enjoyment
C．satisfying drivers' great thrill
D．distance is not a problem at all
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