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发布时间：2006-06-22 13:26     点击：

    (B) It must have been Y.

    (C) It must have been Z.

    (D) It could have been any of the three calls except Y.

    (E) IT could have been any of the three calls except Z.

    15. If the dance begins with the three calls Z, X, and Y, in the order given, it must be true that after the third call.

    (A) Mr. Parda partners Mrs. Jefferson

    (B) Mr. Parda partners Mrs. Roberts

    (C) Mr. Basco partners Mrs. Basco

    (D) Mr. Basco partners Mrs. Jefferson

    (E) Mr. Basco partners Mrs. Roberts

    Questions 16-19

    Four players-W, X, Y, and Z-play a series of games. In each game the four form two pairs that play against one another; one pair wins and one pair loses.

    When a pair wins or loses a game, both players are credited with the win or the loss.

    Games are played in a series in which partners are changed with each game until all possible combinations of partners have played. The series begins again repeating the combinations of partners in the same order.

    16. Which of the following is a possible sequence of partners for W?

    (A) X, Z, Y, X, Y, Z

    (B) Y, X, Z, X, Z,Y

    (C) Y, Z, X, Y, Z, X

    (D) Z, X, Y, Z, Y, X

    (E) Z, Y, X, Y, X, Z

    17. In order that all possible combinations of partners play one game each, how many games must be played?

    (A) 3

    (B) 4

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