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  3. Sporting activities are essentially modified forms of hunting behavior. Viewing biologically, the modern 【S

Sporting activities are essentially modified forms of hunting behavior. Viewing biologically, the modern 【S

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问题     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.        【S3】______.
To understand how this transformation has taken place we
must briefly look up at our ancient ancestors. They spent over a       【S4】______.
million year evolving as co-operative hunters. Their very              【S5】______.
survival depended on success in the hunting-field. Under this
pressure their whole way of life, even if their bodies, became         【S6】______.
radically changed. They became chasers, runners, jumpers,
aimers, throwers and prey-killers. They co operated as skillful        【S7】______.
male-group 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......关在圈中),               【S9】______.
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】______.
【S4】
选项
答案删除up
解析 look up at 为短语重叠，look up 表示“敬仰，杏寻”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。
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