Merge remote-tracking branch 'origin/master' into survey

learnOnline/pages/learnSystem/courseContent/examDetail/examDetail.js

@@ -69,6 +69,8 @@ Page({
               case 1: str += 'B,'; break;
               case 2: str += 'C,'; break;
               case 3: str += 'D,'; break;
+              case 4: str += 'E,'; break;
+              case 5: str += 'F,'; break;
             }
           }
         })