题目内容

It is useful to remember that history is to the nation as memory is to the individual. As persons deprived of memory become disoriented and lost, not knowing where they have been and where they are going, so a nation denied a conception of the past will be disabled in dealing with its present and its future.
History is the best antidote to delusions of omnipotence and omniscience. (52) Self-knowledge is the indispensable prelude to self-control, for the nation as well as for individual. History should forever remind us of the limits of our passing perspectives. It should strengthen us to resist the pressure to convert momentary impulses into moral absolutes. It should lead us to recognition of the fact, so often and so sadly displayed, that the future outwits all our certitudes and that the possibilities of the future are more various than the human intellect is designed to conceive.
(53) A nation informed by a vivid understanding of the ironies of history is best equipped to manage the tragic temptations of military power. Let us not bully our way through life, but let a sensitivity to history temper and civilize our use of power. In the meantime, let a thousand historical flowers bloom. (54) History is never a closed book or a final verdict. It is forever in the interests of an ideology, a religion, a race, and a nation.
The great strength of history is its capacity for self-correction. This is the endless excitement of historical writing: the search to reconstruct what went before. (55) A nation's history must be both the guide and the domain not so much of its historians as its citizens.
(31)

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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】
【B1】