Which of the following is discussed by the author of Passage 1 but not by the author of Passage 2 ?
A、Single-celled bacterium
B、Microevolution
C、Evolutionary mutations
D、The genetic record
E、Intermediate steps
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正确答案
试题解析
第一篇文章的作者提到了基因记录,第二篇文章的作者没有提到遗传记录的存在,故选D项。