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发布时间：2006-06-22 13:30     点击：

　　8. If a tank is to contain fish of exactly three different species, these species could be

　　(A) F, G, and I  (B) F, I, and K

　　(C) G, H, and I  (D) H, I, and J

　　(E) I, J, and L

　　9. If there are to be exactly two species represented in a tank, and three fish of species J are to be in the tank, the other three fish in that tank could be from which of the following species?

　　(A) F (B) G    (C) H   (D) I (E) L

　　10. If a tank is to contain fish of exactly four different species, it CANNOT contain fish of species

　　(A) F (B) G   (C) H   (D) J  (E) L

　　11. Fish of which of the following species could be put into a tank with fish of species G?

　　(A) F and I  (B) F and J    (C) H and I

　　(D) H and K  (E) I and K

　　Questions 12-17

　　Two circular dials of exactly the same size are mounted on a wall side by side in such a way that their perimeters touch at one point.

　　Dial 1, which is on the left, spins clockwise around its center, and dial 2, which is on the right, spins counterclockwise around its center. (Assume that there is no friction at the point of contact between the dials.)

　　Each dial has marked on its perimeter three points that are at equal distances around the perimeter from each other.

　　Going clockwise on each dial the points marked on dial 1 are N, O, and P, and the points marked on dial 2 are X, Y, and Z.

　　12. Which of the following lists the points on a dial in an order in which they could pass consec- utively through the point of contact between the dials?

　　(A) O, N, P  (B) O, P, O   (C) X, Z, Y

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