(E) Y, O, V
17. If Q and W are standing on N's shoulders and M falls, which of the following sets of acrobats could be left standing after all the acrobats who must fall as a result of M's fall have fallen?
(A) N, O, P, Q, V, and W
(B) N, O, P, V, X, and Y
(C) N, P, V, W, X, and Y
(D) O, P, Q, V, X, and Y
(E) O, P, Q, W, X, and Y
18. If V and W stand on different levels, and X and Z stand on the same level, which of the following is a complete and accurate list of the levels on which Y could possibly stand?
(A) Second
(B) Third
(C) Fourth
(D) Second, third
(E) Third, fourth
19. If V and W stand on O's shoulders, and M stands on the same level as N and P and is the only acrobat between them, which of the following must be true?
(A) If M falls, all five of the child acrobats must fall.
(B) If N falls, exactly four of the child acrobats must fall.
(C) If O falls, exactly two of the child acrobats must fall.
(D) If P falls, exactly three of the child acrobats must fall.
(E) If Q falls, exactly three of the child acrobats must fall.
20. If W stands on V's shoulder, and V stands on M's shoulder, which of the following CANNOT be true?
(A) N and V stand side by side on the same level.
(B) W and X stand side by side on the same level.
(C) X and Y stand side by side on the same level.
(D) M stands on the same level as N and P and is the only acrobat between them
(E) M stands on the same level as Y and Z and is the only acrobat between them.
21. If W stands on the shoulders of N and P, and X stands on the shoulders of M and V, which of the following must be true?
(A) M stands of the same level as V and W and is the only acrobat between them.
(B) N stands on the same level as P and Q and is the only acrobat between them.
(C) O stands on the same level as P and Q and is the only acrobat between them.
(D) P stands on the same level as M and V and is the only acrobat between them.
(E) Q stands on the same level as N and O and is the only acrobat between them
22. If N and Y stand on M's shoulders, and Z stands on the shoulders of p and O, which of the following must be standing side by side on the same level as one another?
(A) M and O
(B) M and P
(C) N and Z
(D) P and Q
(E) W and X
23. Only when the alarm is set off in the house will either the police or the fire department arrive there. In order for members of either department to get to the house, they must pass by the school. Only the police passed by the school yesterday, and neither department responded to alarms the day before yesterday.
Which of the following can be properly inferred from the statements above?
(A) The fire department did not arrive at the house yesterday.
(B) The alarm was not set off at the house yesterday.
(C) The police arrived at the house yesterday
(D) The police passed by the school the day before yesterday.
(E) The fire department failed to respond to the alarm that was set off yesterday.
24. A study of twentieth-century data on volcanic eruptions shows a slow sustained rise in reported eruptions, with sharp drops that coincide with the two world wars. The most reasonable interpretation of these data is that volcanic activity in this century has held at a steady level throughout.
Which of the following is most likely to be an assumption underlying the interpretation of the data described?
(A) The slow rise in reported volcanic eruptions in the twentieth century can reasonably be expected to be sustained for the remainder of this century.
(B) Volcanic eruptions constitute only a small percentage of the sum total of volcanic activity, but they tend to get recorded more faithfully than other volcanic activity.
(C) The fact that the sharp drops in reports of volcanic eruptions occurred during the two wars is attributable to random fluctuations in the data.
(D) The variations in the frequency of reports of volcanic eruptions can reasonably be attributed to factors impinging on the reporting activity itself.
(E) Pre-twentieth-century data are too unsystematic to support any reasonably firm conclusions about long-term levels of volcanic activity
25. To watch television with intelligence is a skill that has to
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