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
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
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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