单项选择题X 纠错
A.are usually absent-minded or unrealistic
B.have an irrational attachment to his research
C.do their research within tile framework set by theorists
D.are rarely interested in filling in details of existing theories
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单项选择题
A.he would survive best
B.he would have a lot of trouble
C.his ability to learn would be enhanced
D.the evolution of memory would stop