单项选择题

The purpose of the psychologist's experiments is to test whether smoking has a positive effect on the mental _________ of smokers.

A．faculty
B．volume
C．capacity
D．competence
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单项选择题
The observational abilities of the ancients were to have practical application beyond those of time-reckoning and attempt to predict future _________.
A．incidents
B．episodes
C．events
D．occasions
单项选择题
They had to _________ between problems because of a lack of ability from those of a lack of motivation.
A．distinguish
B．identify
C．explore
D．determine
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