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
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
单项选择题
To keep a conversation flowing smoothly, it is better for the participants ______.
A．not to wear dark spectacles
B．not to make any interruptions
C．not to glance away from each other
D．not to make unpredictable pauses
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