(A) 3
(B) 4
(C) 5
(D) 6
(E) 8
18. If each player has won at least one game, what is the minimum number of games that must have been played?
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
19. At the end of the third game in the first series, which of the following must be true?
(A) There is a player who has won two games and lost one game.
(B) There is a player who has won all three games.
(C) There is a player who has lost two or more games.
(D) There are three players who have lost exactly one game each.
(E) There are three players who have won exactly two games each.
Questions 20-22
A company owns exactly five delivery vans designated K, L, M, N, and O. At the end of the day, each of the vans must be parked in one of three parking lanes numbered 1, 2, and 3, which are each wide enough for just one van and long enough for all five vans. In lane 1, only vans K and L can be parked, but neither of these vans has to be parked in that lane.
N is always parked earlier than O is parked. When parking a van, each driver enters one of the parking lanes from the rear and parks in the front most available position.
No driver parks behind any more of the other vans than he has to at the time.
20. Which of the following could be the parking pattern after all vans have been parked?
(A) K in lane 1; first L, then M, the O in lane 2; N in lane 3
(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.
(B) Increased public awareness of a disease usually leads to an increase in reported instances of the disease.
(C) An obscure disease may sometimes receive a great deal of publicity even though doctors have begun to suspect that the disease no longer exists.
(D) The Center for Disease Control typically concerns itself only with diseases that are of public importance.
(E) It is unusual for the reported instances of a disease to decline sharply after a long period of stability.
24. To produce a pound of protein, herbivorous sea creatures such as abalones require relatively little plant food, whereas carnivores such as tuna feed on herbivores and thus require the conversion of thousands of pounds of plant food. Hence it would be better for ecological balance if people ate abalone instead of tuna.
Which of the following, if true, is the best criticism of the argument above?
(A) Abalone costs much more per pound than tuna does.
(B) Tuna is much easier to harvest than abalone is.
(C) Abalones mature so slowly that meeting market demands would exhaust the stock .
(D) Human beings would require the same amount of protein from either abalone or tuna.
(E) The average specimen of abalone is much smaller than the average specimen of tuna.
25.In an attempt to reverse the deterioration of the postal service in at least some
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