单项选择题
Today the energy problem becomes critical. It ______ an immediate solution.
A．calls on
B．calls for
C．calls up
D．calls at
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单项选择题
Dr. Zhang was always ______ the poor and the sick, his private clinic often providing them with free medical care.
A．tended by
B．absorbed in
C．concerned about
D．reminded of
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单项选择题
______, Sam knows lots of things about philosophy.
A．As he is young
B．As young he is
C．Young as is he
D．Young as he is
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