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发布时间：2006-06-22 13:26     点击：

    Questions 1-6

    Positions 1, 2, 3, and 4 are the only positions that Y and Z, the two hands on a dial, can be in. Y cannot be in the same position as Z at any one time.

    The only possible changes in position are:

    From 1 to 2 and vice versa

    From 2 to 3 and vice versa

    From 3 to 4 and vice versa

    From 4 to 1 and vice versa

    Only one hand can change position at any one time, and each change in position is followed by a period during which both hands are still.

    1. Which of the following is a possible sequence of consecutive positions through which one of the hands could have moved?

    (A) 1, 2, 1, 3

    (B) 1, 2, 3, 1

    (C) 2, 1, 2, 1

    (D) 3, 2, 4, 3,

    (E) 4, 1, 4, 2

    2. If Y is in position 1 and Z is in position 3, each of the following is a possible change from its current position for one of the hands EXCEPT from

    (A) 1 to 2

    (B) 1 to 4

    (C) 2 to 3

    (D) 3 to 2

    (E) 3 to 4

    3. If Y is in position 2 and Z is in position 3, and if each hand changes position exactly once, which of the following could be the two position changes performed?

    (A) From 2 to 3, from 1 to 4

    (B) From 2 to 1, from 3 to 4

    (C) From 2 to 1, from 1 to 4

    (D) From 3 to 2, from 2 to 3

    (E) From 3 to 4, from 4 to 1

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