2015年10月3日SAT阅读机经：

　　Questions are based on the following passage.

　　What was most likely the original

　　purpose of the human appendix？ Experts

　　can only theorize on its use. It may have

　　had the same purpose it has in present-

　　day herbivores， where it harbors colonies Line5

　　of bacteria that help in the digestion of

　　cellulose. Another theory suggests that

　　tonsils and the appendix might

　　manufacture the antibody-producing white

　　blood cells called B lymphocytes； Line10

　　however， B lymphocytes could also be

　　produced by bone marrow. The third

　　theory is that the appendix may "attract"

　　body infections in order to localize the

　　infection in one spot that is not critical to Line15

　　body functioning.

　　1. The author of the passage uses quotation marks in line 13 in order to indicate that

　　A. this theory is the one with which the author most nearly agrees

　　B. this theory is less scientifically valid than the other theories in the passage

　　C. a common word is being used to describe a unique biological process

　　D. a word is being used in a humorous way

　　E. a direct quotation from another source is being used

　　2. How does the theory described in lines 3-7 primarily differ from the other two theories described in the passage？

　　A. It pertains only to plants.

　　B. It concerns a physical pr ocess that occurs in more than one area of the human body.

　　C. It is a theory supported by more experts in the field than are the other two theories.

　　D. It is concerned with the prevention of disease.

　　E. It makes reference to a process presently occurring in other animals.

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（编辑：马菲）