单项选择题

What serves as the evidence that man is changing

A．Man has got stronger eyes now than he ever had.
B．Man's hair is getting thinner and thinner.
C．Man's arms and legs have become lighter and weaker.
D．Man has been growing taller over the past 500 years.

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单项选择题

The word incessantly ( Para 1 ) could best be replaced by ______.

A．confidently
B．constantly
C．intelligently
D．optimistically

单项选择题

What is the passage mainly talking about

A．The reason why the Wright brothers succeeded in manned flight.
B．The role the internal combustion engine played in the Wright brothers' experiments.
C．The Wright brothers' experience as pilots.
D．The importance of gliders to the development of airplane.