分页标题
2011-09-29 11:27:00   来源：作文地带整理    双击单词自动翻译

　　(C) Middle-distance runners who train at high altitudes sometimes lose races to middle- distance runners who train at sea level.

　　(D) The performances of athletes in competitions at all altitudes have improved markedly dur- ing the past twenty years.

　　(E) At altitudes above 5,500 feet, middle-distance runners often better their sea-level running times by several seconds.

　　Questions 7-13

　　When they hold a meeting, seven company executives- T, U, V, W, X, Y, and Z-sit at a rectangular table. Three executives sit along one side of the table, and three sit along the other side, each directly opposite one of the other three. The seventh sits at the head of the table; there is no seat at the foot of the table.

　　U always sits in one of the two seats farthest from the head of the table.

　　Y and V always sit next to each other.

　　V never sits next to Z.

　　If Z does not sit at the head of the table, W sits there.

　　7. Which of the following is an acceptable seating arrangement of the executives, starting with U, moving toward the head of the table, and con- tinuing around the table?

　　(A) U, X, T, Z, V, Y, W

　　(B) U, T, X, Z, Y, V, W

　　(C) U, X, Z, Y, V, W, T

　　(D) U, Z, W, X, V, Y, T

　　(E) U, T, X, W, Z, V, Y

　　8. If W sits directly opposite T, X must sit next to which of the following executives?

　　(A) T (B) U (C) V (D) Y (E) Z

　　9. If T sits directly opposite Z and next to V, which executive must sit directly opposite U?

　　(A) V (B) W (C) X (D) Y (E) Z

　　10. If Z sits directly opposite X, which executive must sit next to U?

　　(A) T (B) V (C) W (D) Y (E) Z

　　11. If T and U sit immediately on either side of X, the executive sitting directly opposite X must be either

　　(A) W or V (B) W or Z (C) Y and V

　　(D) Y or Z (E) Z or V

　　12. If W sits directly opposite U and next to T, the two executives sitting immediately on either side of X must be

　　(A) Y and V (B) Y and W (C) T and Z

　　(D) T and V (E) Z and W

　　13. If Z sits at the head of the table, Y directly opposite U, and V immediately on X's left, what is the total number of possible seating arrange- ments of the executives?