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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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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