1. There were, however, fluctuations in the climatic conditions, with the consequences[主句] that wet conditions were followed by dry ones,[同位语从句] so that the availability of plants and animals oscillated brusquely.[目的状语从句]
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2. It would appear[主句] that the instability of the climatic conditions led populations that had originally been nomadic[定语从句1] to settle down and develop a sedentary style of life,[主语从句] which led in turn to population growth and to the need to increase the amount of food available.[定语从句2]
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第二十三单元
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