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
According to the passage, a conversation between two Americans may break down due to ______.
A．one temporarily glancing away from the other
B．eye contact of more than one second
C．improperly timed ceasing of eye contact
D．constant adjustment of eye contact
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