单项选择题

According to this passage, an assumption is ______.

A．something that everyone knows
B．the idea the writer wants to emphasize
C．the reader's knowledge about the topic
D．foundation of the writer's reasoning
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单项选择题
According to the author, how is the approach of 'physicists to solving scientific problems
A．Practical for scientific purposes.
B．Detrimental to scientific progress.
C．Unimportant in most situations.
D．Expedient, but of little long-term valu
单项选择题
The author implies that scientists develop a healthy skepticism because they are aware that ______.
A．mathematicians are better able to solve problems than scientists
B．changes in axiomatic propositions will inevitably undermine scientific arguments
C．well-defined situations are necessary for the design of reliable experiments
D．some factors in most situations must remain unknown
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