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  3. The rate at which man has been storing up useful knowledge about himself and

The rate at which man has been storing up useful knowledge about himself and

游客2023-10-16  41
问题     The rate at which man has been storing up useful knowledge about himself and the universe has been spiraling upward for 10,000 years. The rate【C1】t______a sharp upward leap thousands of years ago,【C2】w______the invention of writing, but even so it remained painfully slow over centuries of time. In knowledge【C3】(acquire)the next great leap forward did not occur until the invention of movable type in the fifteenth century by Gutenberg and others. Prior【C4】 1500, by the most optimistic【C5】est______, Europe was producing books at a rate of 1 , 000 titles per year. This means that it would take a full century to produce a library of 100, 000 titles. The rate had【C6】ac______so sharply by 1950, four and a half centuries later, that Europe was producing 120, 000 titles a year.【C7】once took a century now took only ten months. By 1960, a【C8】s______decade later, the rate had made another significant jump, so that a century ’ s work could be completed in seven and a half months. And, the output of books【C9】a world scale by the mid sixties, Europe【C10】(include), approached the remarkable figure of 1 ,000 titles per day. [br] 【C5】
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答案 estimates
解析 by the most optimistic estimates据最乐观的估计。
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