Sporting activities are essentially modified forms of hunting behavior. Viewing biologically, the modern S1. __________ footballer is revealed as a member of a disguised hunting pack. His killing weapon has turned into a harmless football and his prey into a goal-mouth. If his aim is inaccurate and he S2. __________ scores a goal, enjoys the hunter's triumph of killing his prey. To understand how this transformation has taken place we S3. __________ must briefly look up at our ancient ancestors. They spent over a S4. __________ million year evolving as co-operative hunters. Their very survival S5. __________ depended on success in the hunting-field. Under this pressure their whole way of life, bodies, became radically S6. __________ changed. They became chasers, runners, jumpers, aimers, throwers and prey-killers. They co-operate as skillful male-group S7. __________ attackers. Then, about ten thousand years ago, when this immensely S8. __________ long formative period of hunting for food, they became farmers. Their improved intelligence, so vital to their old hunting life, were put to a new use-that of penning (把 S9. __________ ……关在圈中), controlling and domesticating their prey. The food was there on the farms, awaiting their needs. The risks and uncertainties of farming were no longer essential for survival. S10. __________
Part IV Error Correction 答案： S1 Viewing在句中作状语，与句子主语modern footballer之间是动宾关系，应该用过去分词，所以Viewing应改为Viewed。 S2 根据概念同现原理，目标准确才有可能得分高，所以从scores high来判断，inaccurate是错误的，应改为accurate。 S3. 句子缺少主语，根据主从句的意思来看，主语应该是he，所以在enjoys前加主语he。 S4 look up at为短语重叠，look up表示"敬仰，查寻"与本句意思不符，应该用look at，表示如果想了解这种转变如何发生，我们就必须看一看我们的祖先是如何作的。 S5 year为可数名词，这里应该用复数形式，应改为years。 S6 用以加强语气，表示"甚至"，应该用even，而不是even if，所以if应该去掉。 S7 chasers, runner, jumpers, aimers, throwers 与pre-killers之间应该是选择并列关系，所以and应改为or。 S8 when用于引导状语从句，但是this immensely long formative period of hunting for food为名词短语，when使用不当，根据句子的意思应该改为after。 S9 主语为their improved intelligence为单数形式，所以谓语动词也应该用单数形式，were应该改为 was。 S10 根据话题原则，farming 应该改为hunting。
bodies, became radically S6. __________
