His determination and devotion to science________his great discovery.[ ]A．co

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His determination and devotion to science________his great discovery.[     ]
A．contributed to
B．lied in
C．resulted from
D．brought about

答案

举一反三

With no one to________in such a frightening situation，she felt very helpless.[     ]
A．turn to
B．turn on
C．turn off
D．turn over

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The fire out of control，all the houses were________.[     ]
A．burnt off
B．burnt out
C．burnt up
D．burnt to the ground

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To keep healthy,Professor Johnson ________ cycling as a regular form of exercise after he retired.[     ]
A. took up
B. caught on
C. carried out
D. made for

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The computer system ________suddenly while he was searching for information on the Internet.[     ]
A. broke down
B. broke out
C. broke up
D. broke in

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"ATM" is a short form which ________ "automated teller machine"．[     ]
A. stands for
B. stands by
C. bases on
D. relies on

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