单项选择题

The underlined word "upbeat" in paragraph 2 probably means ______.

A．hopeful
B．defeated
C．conscientious
D．uncertain
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单项选择题
The author discusses computing machines in the first paragraph primarily in order to ______.
A．indicate the dangers inherent in relying to a great extent on machines
B．illustrate his views about the approach of mathematicians to problem solving
C．compare the work of mathematicians with that of computer programmers
D．provide one definition of intelligence
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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