单项选择题

We should not rely on pocket calculators because ______.

A．they are not clever as our brains
B．they are harmful to our brains
C．we need to use our brains to prevent it from shrinking
D．we could not get enough practice on mathematics

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单项选择题

The research findings based on ______.

A．a survey of Japanese farmers
B．the study of brain volumes of different people
C．tests performed on a thousand old people
D．the latest development of computer technology