diff --git a/app/controllers/exercise_controller.rb b/app/controllers/exercise_controller.rb
index 25b5dacec..9c073afa8 100644
--- a/app/controllers/exercise_controller.rb
+++ b/app/controllers/exercise_controller.rb
@@ -485,7 +485,7 @@ class ExerciseController < ApplicationController
           ea.answer_text = params[:answer_text]
           if ea.save
             @percent = get_percent(@exercise,User.current)
-            render :json => {:text => pv.vote_text,:percent => format("%.2f", @percent)}
+            render :json => {:text => ea.answer_text,:percent => format("%.2f", @percent)}
           else
             render :json => {:text => "failure"}
           end
diff --git a/app/views/courses/settings.html.erb b/app/views/courses/settings.html.erb
index d330551d1..ae6416c9d 100644
--- a/app/views/courses/settings.html.erb
+++ b/app/views/courses/settings.html.erb
@@ -66,7 +66,7 @@
           <li class=" mb5 ml80">
             <label >公开&nbsp;&nbsp;：</label>
             <input <%= @course.is_public == 1 ? 'checked' : ''%> id="course_is_public" name="course[is_public]"  type="checkbox">
-            <span class="c_grey">（选中后课外用户可见该课程，否则仅对课内成员可见。）</span>
+            <span class="c_grey">（选中后课外用户可见该课程，否则仅对课内成员可见）</span>
             <div class="cl"></div>
           </li>
           <li class=" mb5 ml30">
diff --git a/app/views/exercise/_exercise_student.html.erb b/app/views/exercise/_exercise_student.html.erb
index 8a1f3dbd6..4f4892b79 100644
--- a/app/views/exercise/_exercise_student.html.erb
+++ b/app/views/exercise/_exercise_student.html.erb
@@ -100,6 +100,9 @@
                                               {
                                                   obj.checked = false;
                                               }
+                                          },
+                                          error: function () {
+                                              alert("网络异常，答题失败，请确认网络正常连接后再答题。");
                                           }
                                       });
                                   }
@@ -154,6 +157,9 @@
                                               {
                                                   obj.checked = false;
                                               }
+                                          },
+                                          error: function () {
+                                              alert("网络异常，答题失败，请确认网络正常连接后再答题。");
                                           }
                                       });
                                   }
@@ -196,6 +202,9 @@
                               success: function (data) {
                                   var dataObj = eval(data);
                                   obj.value = dataObj.text;
+                              },
+                              error: function () {
+                                  alert("网络异常，答题失败，请确认网络正常连接后再答题。");
                               }
                           });