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从时间尺度看，通常把地球气候变化史划分为地质时期，历史时期和近现代三个阶段，地质时期的气候，是指距今1万年以前，以冰期与间冰期交替出现为特点，时间尺度在10万年以上。读地质时期的气候变化图，回答（6分）： ⑴地质时期经历了三次大冰期分别是： 、 、 。 ⑵就冷暖状况而言，地质时期的气候变化过程中，时间较长的是： 。 ⑶就干湿状况而言，新生代就要以 期为主。 ⑷恐龙灭绝时期的气候特点是： 。
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