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Sporting activities are essentially modified forms of hunting behavior.
Viewing biologically， the modern footballer is revealed as a member of a disguised __1__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 scores a goal， __2__enjoys the hunter's triumph of killing his prey. __3__To understand how this transformation has taken place we must briefly look up at our ancient ancestors. They spent over a million __4__year evolving as co-operative hunters. Their very survival depended on success __5__in the hunting-field. Under this pressure their whole way of life， even if their __6__bodies， became radically changed. They became chasers， runners， jumpers， aimers， throwers and prey-killers. They co-operate as skillful male-group __7__attackers.
Then， about ten thousand years ago， when this immensely long formative __8__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， __9__controlling and domesticating their prey. The food was there on the farms，awaiting their needs. The risks and uncertainties of farming were no longer __10__essential for survival.
答案：1 將viewing改爲viewed。非謂語動詞view和句子的主語是邏輯動賓關係。
2 將inaccurate改爲accurate。如果真的'目標不準確，也就不可能進球了(he scores a goal)。
3 在enjoys前面加he。由於前面if his aim is accurate and he scores a goal 是條件狀語從句，因此可見這裏是主句，主句的主語he是不可以省略的。
4 將look up at的up省略
5 將year變爲複數
6 將if去掉
7 將co-operate 改爲co-operated
8 將when改爲after
9 將were改爲was。該謂語動詞的主語是Their improved intelligence，是單數。
10 將farming改爲hunting。縱觀全文，在從事種植業後，“狩獵”而不是“農耕”的危險和不確定性對人們的生存已經不再那麼重要了。
