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

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单项选择题

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

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