历年真题：GRE试题4

   

　　Questions 16-22

　　In each of the five consecutive days of a cooks' con- tention, exactly one of five well-known cooks―G, H, J, K, and L―will cook a demonstration meal．Each of the five cooks will cook exactly one of the five meals．The schedule for the cooks is constrained by the following conditions：

　　H cannot cook on any of the first three days．

　　L must cook on one of the days before the day on which H cooks．

　　J must cook on one of the days before the day on which G cooks．

　　G must cook on one of the days before the day on which K cooks．

　　16.Which of the following can be the order, from first to fifth, in which the five cooks cook the meals？

　　(A)G, K, L, J, H

　　(B)J, G, K, H, L

　　(C)J, G, K, L, H

　　(D)J, K, G, L, H

　　(E)L, J, H, K, G

　　17.If K cooks the fourth meal, which of the following must be true？

　　(A)G cooks on the third day．

　　(B)H cooks on the fifth day．

　　(C)J cooks on the first day．

　　(D)J cooks on the second day．

　　(E)L cooks on the third day．

　　18.Which of the following can be true？

　　(A)G cooks the first meal．

　　(B)J cooks the fourth meal．

　　(C)L cooks the fifth meal．

　　(D)H cooks on some day before G cooks．

　　(E)L cooks on some day after K cooks．

　　19.If G cooks a meal on some day before L does, then it must be true that

　　(A)G cooks the second meal

　　(B)J cooks the third meal

　　(C)H cooks the fourth meal

　　(D)K cooks the fifth meal

　　(E)L cooks the fourth meal

　　20.If J does not cook on the first day, then it must be true that

　　(A)G does not cook the third meal

　　(B)H does not cook the fourth meal

　　(C)J does not cook the second meal

　　(D)L does not cook the third meal

　　(E)K does not cook the fifth meal