单项选择题

Grinols is primarily concerned with ______ in his new book.

A．demonstrating the prevalence of gambling
B．examining the benefits and costs of gambling
C．exploring the causes of gambling
D．showing whether the benefits of gambling outweigh its costs

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单项选择题

Which of the following is NOT true of Earl L. Grinols

A．He is an American economist.
B．He works in a university.
C．He is a senior economic presidential adviser.
D．He has just published a new book.

单项选择题

The tone of this book review is ______.

A．appreciative
B．objective
C．biased
D．negative