单项选择题

In the author's opinion, ______.

A．theorists never need society
B．a scientist should not try to adapt himself to the world
C．a non-theorist never tries to adapt the world to himself
D．theorists should contribute to the progress of human society

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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