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
The reason why the mice in Ader's experiment avoided saccharin was that ________.
A．they disliked its taste
B．it affected their immune systems
C．it led to stomach pains
D．they associated it with stomach
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