The physicist rightly dreads precise argument, since an argument that is convincing only if it is precise loses all its force if the assumptions on which it is based are slightly changed, whereas an argument that is convincing though imprecise may well be stable under small perturbations of its underlying assumptions.

　　21. The author discusses computing machines in the first paragraph primarily in order to do which of the following?

　　 Indicate the dangers inherent in relying to a great extent on machines

　　 Illustrate his views about the approach of mathematicians to problem solving

　　 Compare the work of mathematicians with that of computer programmers

　　 Provide one definition of intelligence

　　 Emphasize the importance of computers in modern technological society

　　22. According to the passage, scientists are skeptical toward their equations because scientists

　　 work to explain real, rather than theoretical or simplified, situations

　　 know that well-defined problems are often the most difficult to solve

　　 are unable to express their data in terms of multiple variables

　　 are unwilling to relax the axioms they have developed

　　 are unable to accept mathematical explanations of natural phenomena

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