掌握了GRE阅读里的长难句，到了实战演习的时候了。GRE阅读练习帮助GRE考生循序渐进地进行复习和总结。希望GRE考生在进行GRE阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。
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 onThursday.
No one can have telephone duty on more than four of the five days of the week.
1.Which of the following can be the week's telephone duty schedule?
Monday Tuesday Wednesday Thursday Friday
(A) George George Hilda George Hilda Hilda Irene Irene Hilda Irene
(B) George Hilda George Hilda George Hilda Irene Hilda Irene Irene
(C) George Hilda George George George Irene Irene Hilda Hilda Hilda
(D) Hilda Hilda George George Hilda Irene Irene Hilda Hilda Irene
(E) Hilda Hilda George George George Irene Irene Hilda Irene Irene
2.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 together on 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.
3.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.
4.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.
5.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.
6.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
答案：CAB DDB