历年真题：GRE试题6

  

　　6.If cookie H and cookie Y are each featured on　Monday, Tuesday, and Wednesday, and if cookie G　and cookie X are each featured on Thursday, Friday　and Saturday, then the cookies featured on Sunday　must include both

　　(A) J and K

　　(B) J and L

　　(C) J and O

　　(D) K and L

　　(E) K and Z

　　7.If exactly seven kinds of cookies are featured during　one week, which of the following must be true about　that week?

　　(A) X is the only kind of plain cookie that is featured

　　(B) Y is the only kind of plain cookie that is featured

　　(C) Z is the only kind of plain cookie that is featured.

　　(D) On at least one day, both cookie G and cookie Z　are featured.

　　(E) On at least one day, both cookie J and cookie Xare featured.

　　8.If cookie X is featured exactly twice and cookie Z is　featured exactly three times in one week, which of　the following must be true?

　　(A)Cookie G is featured exactly three times during　the week.

　　(B)Cookie J is featured at most twice during the　week.

　　(C)Cookie K is featured at most twice during the　week.

　　(D)Cookie L is featured at most twice during the　week.

　　(E) Cookie Y is featured exactly twice during the　week.

　　9. In recent years, there has been a dramatic decline in　the population of the shrike, a predatory bird that　inhabits flat land, such as farms and pastures. Some　ornithologists hypothesize that this decline is due to　the introduction of new, more effective pesticides to　control the insect species on which shrikes prey.

　　The answer to which of the following questions is　NOT relevant to evaluating the ornithologists'　hypothesis?

　　(A) Was there a decline in the shrike population　before the new pesticides were first used?

　　(B) Have shrike populations declined significantly　in those habitats where the new pesticides have　not been used?

　　(C) Have the new pesticides more significantly　reduced the population of insect species on　which shrikes prey than did the pesticides previously　used?

　　(D) Are insects that have consumed the new pesti-　cides more toxic to the shrikes that eat those　insects than were insects that consumed the　less effective pesticides?

　　(E) Are the new pesticides considered by most　people to be less harmful to the environment　than the old pesticides were considered to be?

　　10. Census data for Prenland show that unmarried　Prenlandic men in their thirties outnumber unmarried

　　Prenlandic women in that age group by about ten to　One. Most of these men do wish to marry. Clearly,　however, unless many of them marry women who　are not Prenlandic, all but a minority will remainunmarried.

　　The argument makes which of the following assump-tions?

　　(A) Emigration from Preland is more common　among women than among men.

　　(B) A greater proportion of Prelandic women　in their thirties than of Prenlandic men of the　same age would prefer to remain unmarried.

　　(C) It is unlikely that many of these unmarried　Prenlandic men will marry women more than　a few years older than themselves.

　　(D) Prenland has a high rate of divorce.

　　(E) Most of the unmarried Prenlandic men are　unwilling to marry women who are not　Prenlandic.