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发布时间：2006-06-22 13:26     点击：

    (B) K in front of L in lane 1; no van in lane 2; first M, then N, then O in lane 3

    (C) K in front of L in lane 1; M in lane 2; O in front of N in lane 3

    (D) K in front of N in lane 1; L in lane 2; M in front of O in lane 3

    (E) L in front of K in lane 1; N in front of O in lane 2; M in lane 3

    21. Each of the following could be true after all of the vans have been parked EXCEPT:

    (A) K is the only van parked in lane 2.

    (B) L is the only van parked in lane 1.

    (C) L and O are both parked in lane 3.

    (D) M and N are both parked in lane 2.

    (E) M and O are parked in different lanes.

    22. If all five of the vans are parked, but none of them in lane 1, which of the following must be true?

    (A) K was parked earlier than L was.

    (B) N was parked earlier than M was.

    (C) O was the last van to be parked.

    (D) K and L were the first two vans to be parked.

    (E) M and O were the last two vans to be parked.

    23. Recent data from the Center for Disease Control indicate a decline in the reported instances of disease Q. This decline is surprising, because it follows a period in which the formerly obscure Q received a great deal of publicity in the news media.

    Which of the following, if assumed by the author to be true, would provide the most logical explanation of the author's surprise at the reported decline?

    (A) Increased public awareness of a disease usually stimulates efforts to eradicate the disease.

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