单项选择题

A．prove that foreign experts are important for the U. S……

The fact that key members of team that built America's first nuclear bomb were foreigners is used to ______.

A．prove that foreign experts are important for the U. S.
B．prove visa system used to be more effective in the past
C．show that visa system was not really necessary in the past
D．explain that countries have always been competing for professions

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单项选择题The author implies all of the following EXCEPT ______.

A．the US relies heavily on foreign professionals.
B．visa system may be useless, or even harmful
C．the US government has not put high technology to good use
D．the more efficient the government, the safer the country

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

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

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