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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 employeesGeorge, Hilda, and Irenemust 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 weeks telephone duty schedule? Monday Tuesday Wednesday Thursday Friday George George Hilda George Hilda Hilda Irene Irene Hilda Irene George Hilda George Hilda George Hilda Irene Hilda Irene Irene George Hilda George George George Irene Irene Hilda Hilda Hilda Hilda Hilda George George Hilda Irene Irene Hilda Hilda Irene 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? | 
