We thank Dr. Dave Green (MRAO, UK) for one comment and one identified problem in our paper (ChJAA, 5(2), 165). The comment is that we did not discuss selection effects of the current sample of supernova remnants, which can be found in Case & Bhattacharya (1998) and Green (2004). The problem is the mis-usage of some SNR distances in Gusienov et al. (2003) and other references which were obtained from the assumed Σ-D relation. We mixed them to other data to derive the SNR diameters and SNR luminosity for statistics. This seriously affects the discussions in Section 3.3 and Figures 3 and 4. We cleaned out the flawed data and revise this part of the paper in the electronic version at http://www.chjaa.org.