单项选择题

This passage mainly deals with ______.

A．food storage
B．advantages of canned food
C．the art of canning
D．canning food
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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
The author intends to imply that ______ by saying we are deprived of the use of our eyes .
A．people are lazy to use their eyes
B．eyes become useless in traveling at high speed
C．people fail to see anything on his way of travel
D．people want to sleep during traveling
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