单项选择题

A．He has learned a lot from his own mistakes.
B．He is quite experienced in taming wild dogs.
C．He finds reward more effective than punishment.
D．He thinks it important to master basic training skills.
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单项选择题
The new trend in artificial intelligence research stems from ______.
A．the shift of the focus of study on to the recognition of the shapes of objects
B．the belief that human intelligence cannot be duplicated with logical, step-by-step programs
C．the aspirations of scientists to duplicate the intelligence of a ten-month-old child
D．the efforts made by scientists in the study of the similarities between transistors and brain cells
单项选择题
One of the reasons why commercials are able to attract viewer attention is that______.
A．the human voices in commercials have more auditory impact
B．people like cheerful songs that change dramatically in sound quality
C．high-frequency sounds are used to mask sounds that drown out the primary message
D．they possess sound qualities that make the viewer feel that something unusual is happening
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