注:1. 看第一句三个单词就知道本段内容和上一段相同。
2. passive被动的
21. 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
注:定位文章第一段found之后
22. According to the passage, the experience of helplessness causes rats to ______.
A) try to control unpleasant stimuli
B) turn off the electricity
C) become abnormally suspicious
D) behave passively in controllable situations
注:定位第二段But之后那句话
23. 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
22. The first paragraph is mainly about _____.
the teenagers criticism of their parents
misunderstandings between teenagers and their parents
the dominance of the parents over their children
the teenagers ability to deal with crises
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