54. What constitutes a major threat to the survival of turtles according to Elizabeth Griffin? 　　(A)Their inadequate food supply. 　　(B)Unregulated commercial fishing. 　　(C)Their lower reproductively ability. 　　(D)Contamination of sea water

58. The two Harvard economists note in their study that, for much of the 20th century, ________. 　(A)enrollment kept decreasing in virtually all American colleges and universities 　　(B)the labor market preferred high-school to college graduates 　　(C)competition for university admissions was far more fierce than today 　　(D)the gap between the earnings of college and high-school graduates narrowed

54. What constitutes a major threat to the survival of turtles according to Elizabeth Griffin? (A)Their inadequate food supply. (B)Unregulated commercial fishing. (C)Their lower reproductively ability. (D)Contamination of sea water

其他試題

54. What constitutes a major threat to the survival of turtles according to Elizabeth Griffin? 　　
(A)Their inadequate food supply. 　　
(B)Unregulated commercial fishing. 　　
(C)Their lower reproductively ability. 　　
(D)Contamination of sea water