11.Certain extremely harmful bacteria found only in sewage are difficult to detect directly. Testing for E. coli, an easily detected and less harmful type of bacteria, in ocean water would be a reliable way of determining whether or not these more harmful bacteria are present, since ocean water contains E. Coli only if the water is contaminated with sewage that contains the harmful bacteria. Which of the following, if true, most seriously weakens the argument?
(A) There are many different strains of the E. coli bacteria, and only some of these strains are harmful.
(B) Some types of bacteria found in sewage are neither disease causing nor difficult to detect directly.
(C) Some of the types of bacteria found in sewage along with E. coli are not harmful to people unless the bacteria are ingested in large quantities.
(D) E. coli dies out much more quickly than some of the more harmful bacteria found in sewage and then can no longer be easily detected.
(E) Some of the types of bacteria found in sewage along with E. coli reproduce at a slower rate than E. coli.
Questions 12-17
A bank has exactly four cashier windows, arranged in a row and numbered consecutively 1through 4 from one end of the row to the other. The bank has exactly six cashiers: two supervisors (Joan and Karim); and four trainees (Lorraine, Mark, Nora, and patrick). Throughout a particular peak-hour period, the stationing of cashiers at windows is restricted as follows:There must be exactly one cashier at each window.The cashier at window 2 must be a supervisor.Lorraine must be at a window but cannot be at window 3. If Mark is at one of the windows, Joan must be at a window immediately adjacent to it. The cashiers at the windows must include either Nora or Patrick, but they cannot include both Nora and Patrick.
12.Which of the following lists the cashiers who can be stationed at windows 1 through 4 during this period?1 2 3 4
(A) Joan Karim Mark Lorraine
(B) Joan Karim Nora Lorraine
(C) Karim Nora Joan Lorraine
(D) Mark Joan Lorraine Patrick
(E) Patrick Joan Nora Lorraine
13.Which of the following must be true about the stationing of the cashiers during this period?
(A) Joan is at window 1 or at window 2.
(B) Karim is at window 2 or at window 4.
(C) Lorraine is at window 1 or window 4.
(D) Nora is at window 1 or at window 3.
(E) Patrick is at window 3 or at window 4.
14.sarily in that order, are stationed at immediately adjacent windows, which of the following must be stationed at window 4 during this period?
(A) Joan
(B) Karim
(C) Lorraine
(D) Mark
(E) Patrick
15.If during this period Lorraine and Mark, not necessarily in that order, are stationed at immediately adjacent windows, which of the following can be stationed at window 1 during this period?
(A) Joan
(B) Karim
(C) Lorraine
(D) Mark
(E) Nora
16.If during this period Lorrained and Nora, not necessarily in that order, are stationed at immediately adjacent windows, which of the following must be true during this period?
(A) Joan is stationed at window 1.
(B) Joan is stationed at window 2.
(C) Karim is stationed at window 2
(D) Nora is stationed at windows 3.
(E) Patrick is stationed at window 1.
17.If during this period Mark is stationed at a window,which of the following CANNOT be stationed at a window during this period?
(A) Joan
(B) Karim
(C) Lorraine
(D) Nora
(E) Patrick
Questions 18-22
Seven photographs—three landscapes: F, H, and J; and four still lifes: Q, R, T and W—will appear on the first seven pages—numbered consecutively from page 1 through page 7—of an exhibit catalog. Each page will contain exactly one of the photographs. The ordering of the photographs in the catalog is governed by the following conditions. J and W, not necessarily in that order, must appear on consecutively numbered pages.The three landscapes cannot appear on-consecutively numbered pages. Neither page 2 not page 4 is a page on which a landscape can appear. A landscape must appear on page 7
18.Which of the following is an acceptable ordering of the photographs in the catalog?
Page 1 Page 2 page 3 Page 4 page 5 page 6 page 7
(A) F T H Q W R J
(B) H Q J W R F T
(C) J W H R T Q F
(D) Q T R W J F H
(E) T F Q W J R H
19.Any of the following can appear on page 3 EXCEPT
(A) J
(B) Q
(C) R
(D) T
(E) W
20. If F appears on page 6, H must appear on page
(A) 1
(B) 2
(C) 3
(D) 5
(E) 7