单项选择题

Anthorpologists label nowadays men" Legless" because ______.

A．people forget how to use his legs
B．people prefer cars, buses and trains
C．lifts and escalators prevent people from walking
D．there are a lot of transportation devices

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单项选择题

Travelling at high speed means ______.

A．people's focus on the future
B．a pleasure
C．satisfying drivers' great thrill
D．a necessity of life

单项选择题

Why does the author say we are deprived of the use of our eyes

A．People won't use their eyes.
B．In traveling at high speed, eyes become useless.
C．People can't see anything on his way of travel.
D．People want to sleep during travelin