C. the scientific community.

　　D. people who make good contribution to science.

　　47.We need to know something about the structure and operation of science because

　　A. it is not easy to understand the things that excite and frustrate scientists.

　　B. Science affects almost every aspect of our life.

　　C. Scientists live in a specific subculture.

　　D. It is easier to understand general characteristics of science.

　　48.The book mentioned in this passage is written for readers who

　　A. are intelligent college students and lay person who do not know much about science.

　　B. are good at producing various gadgets.

　　C. work in a storehouse of dried facts.

　　D. want to have a superficial understanding of science.

　　49.According to this passage,

　　A. English is a sexist language.

　　B. only in the scientific world is the role of women increasing rapidly.

　　C. women are making significant contributions to eliminating the inadequacy of our language.

　　D. male nouns or pronouns should not be used to refer to scientists.

　　50.This passage most probably is

　　A. a book review.

　　B. the preface of a book.

　　C. the postscript of a book.

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