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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2023-10-15  23
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] 【C4】
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答案 to
解析 prior to“在……之前”，相当于before。
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