单项选择题

It isestimated that a scientific principle has a life expectancy of approximately a decade before it drastically revised or replaced by newer information.()

A.estimated
B.a life expectancy
C.decade
D.it drastically

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单项选择题
The Trojan War proved to the Greeks that cunning and () were often more effective than military might.

A. artifice
B. strength
C. wisdom
D. beauty
单项选择题
The private detective, having received new information from a confidential source, narrowed down the () of his enquiry into the case.

A. aspect
B. sphere
C. dimension
D. scope
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