GRE Text Completion: JiJing 1373-GRE填空机经1373题 - O4MEI2H435F4BZM7A

At a recent conference on ancient DNA, one presentation opened with the claim that the field was now mature and could move ahead with confidence. This (i)____________ is (ii)____________, as demonstrated at the conference by the many presentations that notably lacked an adequate methodology for ensuring that DNA was uncontaminated by material that is more recent. In fact, ancient DNA research presents extreme technical difficulties, in part precisely because of the (iii)____________ of surviving DNA. A. concern B. infectious C. corrupted nature D. optimism E. unfounded F. straight forward G. diffidence H. unusual I. copious amounts