Doyouknowwhydifferen的精选

问题详情：根据短文内容及首字母提示，填写所缺单词，使短文意思完整。每空一词Doyouknowwhydifferentanimalsorpests(害虫)havetheir(1)s________colours?Coloursinthemseemtobemainlyusedtoprotectthemselves.Somebirdsli...