单项选择题

Which of the following, if true, would most dearly have supported the conclusion referred to in lines 9—12

A．Ratings of productivity correlated highly with ratings of both accuracy and attendance.
B．Electronic monitoring greatly increased productivity.
C．Most supervisors based overall ratings of performance on measures of productivity alone.
D．Overall ratings of performance correlated more highly with measures of accuracy than with measures of productivity.
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单项选择题
The primary purpose of the passage is to ______.
A．contrast possible outcomes of a type of business investment.
B．suggest more careful evaluation of a type of business investment.
C．illustrate various ways in which a type of business investment could fail to enhance revenues.
D．trace the general problems of a company to a certain type of business investment.
单项选择题
It can be inferred that the author of the passage discusses unmonitored workers'(line 6) primarily in order to ______.
A．compare the ratings of these workers with the ratings of monitored workers
B．provide an example of a case in which monitoring might be effective
C．provide evidence of an inappropriate use of CPMCS
D．emphasize the effect that CPMCS may have on workers' perceptions of their jobs
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