单项选择题

Until recently, such ______ was limited to telephone questions and answers much like daytime talk shows.

A．interspersion
B．interactivity
C．interference
D．intermission
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单项选择题
The intellectually ______ enterprise of science depends on free communication.
A．depressing
B．depressed
C．exhilarating
D．exhilarated
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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