单项选择题

Dr.Smith failed many times but he finally() to find a successful way to solve the problem.

A．broke off
B．broke down
C．broke out
D．broke through

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单项选择题
According to the psychoanalyst Sigmund Freud, wisdom comes from the ()of maturity.

A．fulfillment
B．achievement
C．establishment
D．accomplishment
单项选择题
China started its nuclear power industry only in recent years and should () no time in catching up.

A．delay
B．lessen
C．lose
D．slip
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