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GRE试题:GRE北美试题20
来源:英语学习网 点击数: 更新时间:2006-5-1  
soared under federal protection during the last few decades. However, because the species repopulated itself through extensive inbreeding, it now exhibits a genetic uniformity that is almost unparalleled in other species of mammals, and thus it is in far greater danger of becoming extinct than are most other species.

Given the information in the passage above, which of the following is most likely the reason that other species of mammals are less likely than elephant seals to become extinct?

(A) Other species of mammals have large popula- tions, so the loss of a few members of the species is not significant.

(B) Other species of mammals have increased their knowledge of dangers through the experience of generation after generation of animals.

(C) In other species of mammals, hunters can readily distinguish between males and females or between young animals and adults.

(D) In other species of mammals, some members of the species are genetically better equipped to withstand a disease or event that destroys other members of the species.

(E) Other species of mammals have retained habits of caution and alertness because they have not been protected as endangered species.

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?

(A) 1 (B) 2 (C) 3 (D) 4 (E) 5

Questions 14-16

A weaver who is working on six rugs-G, H, I, J, K, and L-is preparing a work schedule for a work week consisting of five consecutive workdays- Monday through Friday. Rugs G, H, and I are of pattern 1, rugs J and K are of pattern 2, and rug L is of pattern 3.The work must be scheduled in accor- dance with the following conditions:

The weaver must work on each of the six rugs dur- ing the work week.

The weaver cannot work on the same rug on two consecutive days.

On any day that the weaver works on rug G, the weaver must work on rug J; the weaver cannot work on rug L that day.

On any day that the weaver works on more than one rug, those rugs must all be of different pat- terns.

14. The weaver could schedule work on which of the following rugs for the same day?

(A) G, J, and L (B) G, I, and K

(C) G, J, and K (D) H, I, and L

(E) H, J, and L

15. If the weaver's decision is to work on rug J on Tuesday, the weaver CANNOT work on rug

(A) G on Monday (B) H on Tuesday

(C) I on Wednesday (D) K on Thursday

(E) L on Friday

16. If the weaver's decision is to work on rug G on Monday and Friday only, and on rug K on Wednesday only, the weaver must work on a rug of pattern 2 on exactly how many workdays?

(A) 1 (B) 2 (C) 3 (D) 4 (E) 5

Questions 17-22

Ruth, Sandra. Thea, and Ulla are the four finalists in a contest in which they perform set exercises on a balance beam. In each round of the contest, different exercises must be attempted. A contestant is eliminated the first time she fails at any of the exercises. To reduce any effect that the relative order of contestants within rounds may have on their performance, their relative order must be changed in going from one round to the next if it is possible to do so by executing one of the following three alternative reorderings between rounds:

X: Move the previously third contestant directly in front of the previously second contestant.

Y: Move the previously third contestant directly in front of the previously first contestant.

Z: Move the previously last contestant into first position.

If a contestant mentioned in a reordering has just been eliminated, that reordering cannot be exe- cuted.

If none of the reorderings can be executed, the remaining contestants must perform in the same order relative to each other as in the previous round.

17. If the order of contestants in one round is Ulla, Ruth, Sandra. Thea, and if Sandra is alone in being eliminated in that round, the order of contestants for the next round must be which of the following?

(A) Ruth, Thea, Ulla (B) Ruth, Ulla, Thea

(C) Thea,

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