GRE Text Completion: JiJing 1373-GRE填空机经1373题 - P15RT5CW5J7753AGA

While it's hard to know for sure, I suspect that the well-known authority's silence on this contentious topic reflects the cautious ____________ of a sensible scientist confronted with mixed data and mountains of speculation. A. neutrality B. impartiality C. optimism D. diffidence E. commitment F. buoyancy