六级经典阅读2

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　　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

　　l4.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

　　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

　　答案：Passage 1 ： CDABC

　　Passage 2： CDDBA

　　Passage 3： BADAC

　　Passage 4： BCDCB

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