2. 外语
  3. The hunter-gatherer tribes that today live as our prehistoric 【B1】 ______ human ancestors consume primarily a vegeta

The hunter-gatherer tribes that today live as our prehistoric 【B1】 ______ human ancestors consume primarily a vegeta

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问题     The hunter-gatherer tribes that today live as our prehistoric             【B1】 ______
human ancestors consume primarily a vegetable diet supplementing              【B2】 ______
with animal foods. An analysis of 58 societies of modern hunter-
gatherers, including the Kung of southern Africa, revealed that
one-half emphasize gathering plant foods, one-third concentrate on
fishing, and only one-sixth are primarily hunters. Overall, two-thirds and     【B3】 ______
more of the hunter-gatherer’s calories come from 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 calories,                   【B4】 ______
as an hour of gathering produces 240.                                          【B5】 ______
    Plant foods provide for 60 percent to 80 percent of the Kung diet,         【B6】 ______
and no 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 of medical care. They experience no obesity,       【B7】 ______
and no middle-aged spread, little dental decay, no high blood pressure, no
heart disease, and their blood cholesterol level are very low (about half of   【B8】 ______
the average American adult. ) If no one is suggesting that we return to        【B9】 ______
an aboriginal life, we certainly could use their eating habits
as a model for healthier diet.                                                 【B10】 ______
选项
答案将as改成like。
解析 lived like our prehistoric human ancestors像我们史前的人类祖先那样活着。as后接从句，因此，在as与our之间加上did也可以。这时，as从句为倒装结构。
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