单项选择题

Stocks are not goods--they merely are （）, exchanging current cash flows for future ones.

A. conducts
B. conduction
C. conduits
D. products

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单项选择题

According to （） across the relevant research community, the published attack represents an extreme position in its demands for proof.

A. soundings
B. echoes
C. sonar systems
D. reflections

单项选择题

In a sense, scientists and engineers in the past have been fortunate, for we became accustomed to being measured by nature itself-- an unwaveringly fair and consistent, （） unforgiving, judge.

A. thus
B. nevertheless
C. therefore
D. albeit

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