C) Sporting activities are vital to human existence because they excuse humans from risks and uncertainties.

　　D) It is farming that makes hunting completely out of date and unnecessary.

　　1. D)sporting activities have actually evolved from hunting对应原文第一句Sporting activities are essentially forms of hunting behavior.

　　2. C)a prey对应原文学His killing weapon has turned into a harmless football and his prey into a goal-mouth.

　　3. B)cooperation对应原文They spent over a million years evolving as cooperative hunters.

　　4. A)sporting activities. 出现地点：This new activity involved all the original hunting sequences but the aim of the operation was no longer to avoid starvation. 注意前一句Hunting for sport replaced hunting for necessity.

　　5. A)Sporting activities satisfy the desire of modern men to practice hunting skills which the forefathers developed for survival为本文主旨.

　　参考译文：

　　追根溯源，体育运动是由狩猎活动演变而来的。从生物学的角度来讲，现代足球运动员实际上就相当于猎队中的成员，只是捕杀猎物的武器变成了没有杀伤力的足球，猎物变成了球门。如果球员射门准确，进球得分，便能享受到猎人成功捕杀猎物那一刻胜利的喜悦。

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