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The hunter-gatherer tribes that today live like 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 ofone-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 Universityof London, showed that gathering is a more productive source of foodthan 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．______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, littledental decay, no high blood pressure, no heart disease, and their bloodcholesterol 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．______
凡能被计算机存储、加工的对象通称为（）
下述哪种疾病不属于急腹症（）。
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平衡计分卡从（）四个维度衡量企业业绩
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回溯法解旅行售货员问题时的解空间树是（）。
以下哪组网络地址和子网掩码正确标识了172.16.128.0---172.16.159.255地址块（）。
数据表中索引是必须的。
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