单项选择题

The main idea of this passage is that ______.

A．employers are checking more closely on applicants now
B．lying about college degrees has become a widespread problem
C．college degrees can now be purchased easily
D．employers are no longer interested in college degrees

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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

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