单项选择题

Laudenslager's experiment showed that the immune system of those rats who could turn off the electricity ______.

A．was strengthened
B．was not affected
C．was altered
D．was weakened
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单项选择题
The passage tells us that the most probable reason for the death of the mice in Ader's experiment was that ______.
A．they had been weakened psychologically by the saccharin
B．the sweetener was poisonous to them
C．their immune systems had been altered by the mind
D．they had taken too much sweetener during earlier conditioning
单项选择题
According to the passage, the experience of helplessness causes rats to______.
A．try to control unpleasant stimuli
B．turn off the electricity
C．behave passively in controllable situations
D．become abnormally suspicious
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