单项选择题

lifts passage most probably is ______.

A．a book review
B．the preface of a book
C．the postscript of a book
D．the concluding part of a book
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单项选择题
The book mentioned in this passage is written for readers who ______.
A．are intelligent college students and lay persons 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
单项选择题
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 the scientist
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
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