单项选择题

The first group was given five doses ______ weekly intervals.

A．at
B．in
C．on
D．for
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单项选择题
The test was to ______ aptitude rather than academic achievement.
A．appraise
B．estimate
C．assess
D．rate
单项选择题
37().

A．modification
B．recruitment
C．adjustment
D．examination
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