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
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
参考答案:
1.C 2.B 3.D 4.A 5.C
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