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Other researchers agree. Jay Weiss, a psychologist at Duke University School of Medicine, has shown that animals who are allowed to control unpleasant stimuli don’t develop sleep disturbances or changes in brain chemistry typical of stressed rats. But if the animals are confronted with situations they have no control over, they later behave passively when faced with experiences they can control. Such findings reinforce

psychologists’ suspicions that the experience or perception of helplessness is one of the most harmful factors in depression.

One of the most startling examples of how the mind can alter the immune response was discovered by chance. In 1975 psychologist Robert Ader at the University of Rochester School of Medicine conditioned (使形成条件反射) mice to avoid saccharin (糖精) by simultaneously feeding them the sweetener and injecting them with a drug that while suppressing their immune systems caused stomach upsets. Associating the saccharin with the stomach pains, the mice quickly learned to avoid the sweetener. In order to extinguish this dislike for the sweetener, Ader reexposed the animals to saccharin, this time without the drug, and was astonished to find that those mice that had received the highest amounts of sweetener during their earlier conditioning died. He could only speculate that he had so successfully conditioned the rats that saccharin alone now served to weaken their immune systems enough to kill them.

11. 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

12. 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

13. 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 stomachaches

14. The passage tells us that the most probable reason for the death of the mice in Ader’s experimen t 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

15. 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

参考答案：BCDCA

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