单项选择题

It is implied in the passage that a theorist pursues science ______.

A．chiefly for changing the world
B．just for challenging the status quo
C．primarily for the benefits of humankind
D．mainly for playing the game of science

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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

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