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仔细阅读 52 B) efforts have been made to protect turtles from dying out. 53 D) The turtles population has decreased in spite of human protection 54 B) Unregulated commercial fishing 55 A) It threatens the sandy beaches on which they lay eggs. 56 C) call for effective measures to ensure sea turtles survival. 57 C) College education is rewarding in spite of the starting costs. 58 D) The gap between the earnings of college and high-school graduates narrowed 59 A)save more on tuition. 60 D)consider college education a consumer product 61 B)A satisfying experience with their budgets | 
