题型分类:事实信息题
原文定位:定位词:the earliest tetrapods differed from their immediate fish ancestors。题干分析是找差别。定位到第五段最后一句,表达“最早的四足动物主要的变化是骨骼系统,即鳍骨、脊柱、骨盆、肩胛骨发生变化”。
选项分析:
A 选项符合定位句。had a different skeletal structure 对应原句中 The principal changes... were in the skeletal system。
B 选项说最早的四足动物有更多食物来源。无中生有。
C 选项说最早的四足动物有一个循环系统 The tetrapods had a circulation system,而原文说的是 The ancestors of these animals already had a circulation system,因此与原文不符。
D 选项说最早的四足动物能够移到新的池塘中。而原文说的是 The ancestors of these animals... and they were mobile, so that they could move to water to drink 应该是它们的祖先具备移动的能力,而不是 the tetrapods。因此该选项与原文不符。
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