单项选择题

Because Bob had stopped reading his technical journals he was ______ of new development in his field.

A．intellectual
B．subtle
C．ignorant
D．tedious
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We should make a clear ______ between the two scientific terms for the purpose of our discussion.
A．distinction
B．discrimination
C．deviation
D．separation
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Parents take a great interest in the ______ questions raised by their children.
A．nasty
B．naive
C．obscure
D．offensive
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