单项选择题

The expression "a bird's-eye view" means______.

A．to see with bird's eyes
B．a bird looks at a beautiful view
C．a survey from a high position looking down
D．a famous place with beautiful scenery
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单项选择题
Anthropologists call the men in modem centuries Legless because ______.
A．people forget how to use his legs and seldom walk anymore
B．people like to sit in ears, buses and trains
C．lifts and escalators prevent people from walking
D．people's legs are injured by modem transportation devices
单项选择题
Food deteriorates during storage because ______.
A．necessary chemical preservatives are totally absent from it
B．it is infected with yeasts, moulds and bacteria
C．heat sterilization destroys infections present in it
D．it isn't fit for storage
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