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发布时间：2006-06-23 11:56     点击：

(D) Some antidepressants act by changing the brain s level of serotonin.

(E) Raising the level of neurotransmitters in the brain effectively relieves depression.

16. The current proposal to give college students a broader choice in planning their own courses of study should be abandoned. The students who are supporting the proposal will never be satisfied, no matter what requirements are established. Some of these students have reached their third year without declaring a major. One first-year student has failed to complete four required courses. Several others have indicated a serious indifference to grades and intellectual achievement.

A flaw in the argument is that it does which one of the following?

(A) avoids the issue by focusing on supporters of the proposal

(B) argues circularly by assuming the conclusion is true in stating th e premises.

(C) fails to define the critical term "satisfied"

(D) distorts the proposal advocated by opponents

(E) users the term "student" equivocally

Questions 17--18

The question whether intelligent life exists elsewhere in the universe is certainly imprecise, because we are not sure how different from use something might be and still count as "intelligent life" Yet we cannot just decide to define "intelligent life" in some more precise way since it is likely that we will find and recognize intelligent life elsewhere in the universe only if we leave our definitions open to new, unimagined possibilities.

17. The argument can most reasonably be interpreted as an objection to which one of the following claims?

(A) The question whether intelligent life exists elsewhere in the universe is one that will never be correctly answered.

(B) Whether or not there is intelligent life elsewhere in the universe, our understanding of intelligent life is limited.

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