单项选择题

"A buyer will get something for nothing most probably means that ______.

A．a buyer will not get what he wants to
B．a buyer will gain more than he loses
C．a buyer will get what he pays for
D．a buyer will get something useful free of charge

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单项选择题As used in the first paragraph of the passage, the word motivate” most probably means ______.

A．making one believe what he does is just
B．providing a story that makes one moved
C．supplying a thought or feeling that makes one act
D．making one deep in thought

单项选择题Psychologists are divided with regard to their attitudes toward ______.

A．the choice between spiritual encouragement and monetary rewards
B．the amount of monetary rewards for students' creativity
C．the study of relationship between actions and their consequences
D．the effects of external rewards on students' performance