单项选择题

Babies will not be stimulated to smile by a person______.

A．whose front view is fully perceived
B．whose face is covered with a mask
C．whose face is seen from the side
D．whose face is free of any covering
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单项选择题
The author is convinced that the eyes are______.
A．of extreme importance in expressing feelings and exchanging ideas
B．something through which one can see a person's inner world
C．of considerable significance in making conversations interesting
D．something the value of which is largely a matter of long debate
单项选择题
In this passage, the author focuses on______.
A．the difficulty of a biographer in finding the proper perspective to do his job.
B．the secret of a biographer to win more readers
C．the techniques required of a biographer to write a good biography
D．the characteristics of different kinds of biographies
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