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GRE模拟题:自测试题二(2)

留学快车整理  08-06-06 00:00:00 责任编辑:Alexia 我要评论 选校
Questions 3-8 On each day of the Monday through Friday workweek,exactly two of three employees-George, Hilda, and Irene-must remain on duty in the office to answer tele-phones during the noon to 1 p.m. lunch break. In the scheduling of telephone duty the following constraints must be met: Hilda and Irene have telephone duty together on

  Tuesday. George and Hilda have telephone duty together on

  Thursday.No one can have telephone duty on more than four of thefive days of the week.

  3.Which of the following can be the week's telephone duty schedule? Monday Tuesday Wednesday Thursday Friday

  (A) George George Hilda George Hilda Hilda IreneIrene Hilda Irene

  (B) George HildaGeorge Hilda George Hilda IreneHilda Irene Irene

  (C) George HildaGeorge George George Irene IreneHilda Hilda Hilda

  (D) Hilda HildaGeorgeGeorge HildaIrene IreneHildaHilda Irene

  (E) Hilda HildaGeorgeGeorge George Irene IreneHildaIrene Irene

  4.If Hilda has telephone duty for exactly two days of the week, which of the following must be true?

  (A)George and Irene have telephone duty together on Wednesday.

  (B)George and Hilda have telephone duty togetheron Friday.

  (C)Hilda and Irene have telephone duty together on Wednesday.

  (D)Hilda and Irene have telephone duty together on Friday.

  (E)Irene has telephone duty for exactly three days of the week.

  5.If Hilda and Irene have telephone duty together on

  Monday and on Wednesday, which of the following

  must be true?

  (A)George and Hilda have telephone duty together

  on Friday.

  (B)George and Irene have telephone duty together

  on Friday.

  (C)George has telephone duty on exactly three of

  the days of the week.

  (D)Hilda has telephone duty on exactly three of the

  days of the week.

  (E)Irene has telephone duty on exactly three of the

  days of the week.

  6.If George and Hilda have telephone duty together on

  Monday and George and Irene have telephone duty

  together on Friday, any of the following can be true

  EXCEPT:

  (A)George and Hilda have telephone duty together

  on Wednesday.

  (B)George and Irene have telephone duty together

  on Wednesday.

  (C)George has telephone duty for four days of the

  week.

  (D)Irene has telephone duty for four days of the

  week.

  (E)Hilda and Irene have telephone duty together for

  two days of the week.

  7.If there is one pair of employees who have telephone

  duty together for three of the five days, which of the

  following must be true?

  (A)George has telephone duty on Wednesday.

  (B)George and Hilda have telephone duty together

  for three days of the week.

  (C)Hilda and Irene have telephone duty together for

  three days of the week.

  (D)One of the three employees has telephone duty

  for exactly two days of the week.

  (E)Exactly one of the workers has telephone duty

  for exactly three days of the week.

  8.Any of the following can be true EXCEPT:

  (A)One pair of employees has telephone duty

  together for exactly one day of the week

  (B)One pair of employees has telephone duty

  together for exactly four days of the week

  (C)The pair of employees that has telephone duty

  together on Monday also has telephone duty

  together on Wednesday

  (D)The pair of employees that has telephone duty

  together on Tuesday also has telephone duty

  together on Wednesday

  (E)The pair of employees that has telephone duty

  together on Thursday also has telephone duty

  together on Friday

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