单项选择题

It seems that mental activities are characteristic of______

A．all plants and animals
B．some insects
C．human beings
D．some machines
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单项选择题
The word idiot (Line 6, Para. 1 ) probably means______
A．a profound person
B．a mental patient
C．a mental disturbed person
D．a foolish or stupid person
单项选择题
We may believe that such words as thought and thinking______
A．are terms that are not clear and will never be exactly defined
B．might come to be better understood because of research into A1
C．have precise biological meanings that refer only to human mental processes
D．should not be used to describe computers
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