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　　52 B) efforts have been made to protect turtles from dying out。

　　53 D) The turtle’s 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 turtle’s 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

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