OG1 阅读 Q28

Choice C is the best answer. （Lines 6-7"can...the"） state that "Two of the possible bases—adenine and guanine—are purines," and on the table the percentages of ade-nine and guanine in yeast DNA are listed as 31.3% and 18.7% respectively.
Choices A, B, and D are incorrect because they do not state the percentages of both purines, adenine and guanine, in yeast DNA.