单项选择题According to this passage, non-theorists in science ______.
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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1.单项选择题According to the passage, if a person never forgot, ______.
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
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