单项选择题

What is the purpose of the author in writing this passage

A．Legs become weaker.
B．Modem means of transportation make the world a small place.
C．There is no need to use eyes.
D．The best way to travel is on foot.

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单项选择题

Traveling 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

Anthropologists label present 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