1. 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
2. Laudenslagers 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
3. The reason why the mice in Aders 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 stomachaches
4. It can be concluded from the passage that the immune systems of animals ________.
A) can be weakened by conditioning
B) can be suppressed by drug injections
C) can be affected by frequent doses of saccharin
D) can be altered by electric shocks
5. The passage tells us that the most probable reason for the death of the mice in Aders experiment was that ________.
A) they had been weakened psychologically by the saccharin
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