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发布时间：2006-06-22 13:31     点击：

　　(B) Behavior indicative of psychological malad- justment does not appear until the third month of a child's life.

　　(C) From the infant's point of view, a hurried labor is more stressful than a gradual, slow delivery.

　　(D) The estimates of the duration of labor were based on obstetricians' estimates of the time of the onset of labor.

　　(E) The infants who have experienced the greatest stress during birth are often too weak to cry for extended periods of time.

　　Questions 8-13

　　The directors of a museum are mounting an exhibi- tion of paintings in a space temporarily partitioned into exactly seven rooms-R, S, T, U X, Y, and Z. Visitors reach room R by an elevator, and they can enter and leave the exhibition only through room R. Once inside, visitors are free to move as they choose from room to room. The following list includes all of the doorways that connect the seven rooms:

　　There is a doorway between R and S, a doorway between R and T, and a doorway between R and X.

　　There is a doorway between S and T.

　　There is a doorway between X and U and a doorway between X and Y.

　　There is a doorway between Y and Z.

　　8. Which of the following rooms CANNOT be the third room of the exhibition that any visitor enters?

　　(A) S (B) T (C) U (D) Y (E) Z

　　9. Which of the following is a room that a visitor must enter before entering room U?

　　(A) S (B) T (C) X (D) Y (E) Z

　　10. If one of the doorways between two exhibition rooms is to be closed off, and yet all rooms are to remain accessible to visitors, the closed-off doorway can be a doorway allowing passage to which of the following rooms?

　　(A) R  (B) U  (C) X (D) Y (E) Z

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