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题目来源：
OG1 阅读 Q31
正确答案：D
题目详解
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Choice D is the best answer. The table clearly shows that the percentage of ade-nine in each organism's DNA is different, ranging from 24.7% in E.coli to 33.2% in the octopus. That such a variability would exist is predicted in（lines 41-43"bases...precise"）, which states that "in a long molecule many different permutations are possible."
Choices A and B are incorrect because the table shows that the percentage of adenine varies between 24.7% and 33.2% in different organisms. Choice C is incorrect because （lines 36-38"Adenine...thymine"）state that adenine pairs with thymine but does not mention the variability of the base composition of DNA.
Choices A and B are incorrect because the table shows that the percentage of adenine varies between 24.7% and 33.2% in different organisms. Choice C is incorrect because （lines 36-38"Adenine...thymine"）state that adenine pairs with thymine but does not mention the variability of the base composition of DNA.
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