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

It can be inferred from this passage that_______.

A．a popular culture is superior to a folk culture
B．a folk culture allows alterations
C．folk cultures will vanish soon under the influence of popular cultures
D．a folk culture is against using all kinds of modern facilities