The hunter-gatherer tribes that today live as our prehistoric human __1__ancestors consume primarily a vegetable diet supplementing with animal foods __2__An analysis of 58 societies of modern hunter-gatherers, including the Kung of southern Africa, revealed that one-half emphasize gathering plants foods, one-third concentrate on fishing, and only one-sixth are primarily hunters,Overall, two-thirds and more of the hunter-gatherer's calories come from _3__plants. Detailed studies of the Kung by the food scientists at the University of London, showed that gathering is a more productive source of food than is hunting. An hour of hunting yields in average about 100 edible __4__calories, as an hour of gathering produces 240. __5__Plant foods provide for 60 percent to 80 percent of the Kung diet, and no __6__one goes hungry when the hunt fails. Interestingly, if they escape fatal infections or accidents, these contemporary aborigines live to old ages despite of the absence __7__of medical care. They experience no obesity, no middle-aged spread, little dental decay, no high blood pressure, no heart disease, and their blood cholesterol levels are very low （about half of the average American adult）. __8__If no one is suggesting that we return to an aboriginal life style, we certainly __9__could use their eating habits as a model for healthier diet. __10__
【答案】
1 將as 改為like.此處的意思是“像史前人類祖先那樣生活”。
2 將supplementing改為supplemented.supplemented 修飾diet，可以看作which is supplemented with animal foods的簡(jiǎn)化形式。
3 將and 改為or.
4 將in改為on.on average 是固定用法。
5 將as 改為while或者whereas
6 刪掉for，或者將provide改為account.此處provide 是及物動(dòng)詞，后面不用介詞for
7 刪掉第一個(gè)of.despite 做介詞，后面直接接名詞。
8 在half后加that.that 指代前面的blood cholesterol levels，不能省略，因?yàn)檫@里是將部落成員的膽固醇含量與美國(guó)人的膽固醇含量相比較。
9 將if改為whereas或者while.此處意思為“盡管沒(méi)有人……，但是……”，是轉(zhuǎn)折關(guān)系。
10 在for后面加不定冠詞a.
【答案】
1 將as 改為like.此處的意思是“像史前人類祖先那樣生活”。
2 將supplementing改為supplemented.supplemented 修飾diet，可以看作which is supplemented with animal foods的簡(jiǎn)化形式。
3 將and 改為or.
4 將in改為on.on average 是固定用法。
5 將as 改為while或者whereas
6 刪掉for，或者將provide改為account.此處provide 是及物動(dòng)詞，后面不用介詞for
7 刪掉第一個(gè)of.despite 做介詞，后面直接接名詞。
8 在half后加that.that 指代前面的blood cholesterol levels，不能省略，因?yàn)檫@里是將部落成員的膽固醇含量與美國(guó)人的膽固醇含量相比較。
9 將if改為whereas或者while.此處意思為“盡管沒(méi)有人……，但是……”，是轉(zhuǎn)折關(guān)系。
10 在for后面加不定冠詞a.