单项选择题

We should not rely on pocket calculators because ______.
[A] they are not clever as our brains [C] they are harmful to our brains
[B] we need to use our brains to prevent it from shrinking [D] we could not get enough practice on mathematics

A．We should not rely on pocket calculators because ______.
B．they are not clever as our brains
C．they are harmful to our brains
D．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
By we are very ambivalent about them ( Lines 3～4, Para. 1) it is meant that ________.[A] we have opposing feelings towards emotions [C] we are quite clear about emotions[B] we have similar ideas of emotions [D] we can do nothing about emotions
A．By "we are very ambivalent about them" ( Lines 3～4, Para. 1) it is meant that ________.
B．we have opposing feelings towards emotions
C．we have similar ideas of emotions
D．we are quite clear about emotions
E．we can do nothing about emotions
单项选择题
The Japanese doctors find out that ______.[A] our brains are aging too early [C] our brains are not getting enough exercise[B] Japanese farmers are ageing at a relatively early age [D] Japanese farmers are losing their ability to think
A．The Japanese doctors find out that ______.
B．our brains are aging too early
C．our brains are not getting enough exercise
D．Japanese farmers are ageing at a relatively early age [D] Japanese farmers are losing their ability to think
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