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
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单项选择题
The example of a bird sleeping in front of a mirror indicates that______.
A．the phenomenon of birds dozing in pairs is widespread
B．BI birds prefer to sleep in pairs for the sake of security
C．even an imagined companion gives the bird a sense of security
D．a single pet bird enjoys seeing its own reflection in the mirror
单项选择题
According to the passage, birds often half sleep because______.
A．they have to watch out for possible attacks
B．their brain hemispheres take turns to rest
C．the two halves of their brain are differently structured
D．they have to constantly keep an eye on their companions
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