diff --git a/app/controllers/exercise_controller.rb b/app/controllers/exercise_controller.rb
index c892b6583..d06f4ee8d 100644
--- a/app/controllers/exercise_controller.rb
+++ b/app/controllers/exercise_controller.rb
@@ -3,7 +3,7 @@ class ExerciseController < ApplicationController
 
   before_filter :find_exercise_and_course, :only => [:create_exercise_question, :edit, :update, :show]
   before_filter :find_course, :only => [:index,:new,:create,:student_exercise_list]
-  helper :Exercise
+  include ExerciseHelper
 
   def index
     remove_invalid_exercise(@course)
@@ -29,7 +29,7 @@ class ExerciseController < ApplicationController
     if has_commit_exercise?(@exercise.id, User.current.id) && (!User.current.admin?)
       redirect_to exercise_index_url(:course_id=> @course.id)
     else
-      @can_edit_poll = (!has_commit_exercise?(@exercise.id,User.current.id)) || User.current.admin?
+      @can_edit_excercise = (!has_commit_exercise?(@exercise.id,User.current.id)) || User.current.admin?
       @percent = get_percent(@exercise,User.current)
       exercise_questions = @exercise.exercise_questions
       @exercise_questions = paginateHelper exercise_questions,5 #分页
@@ -145,7 +145,7 @@ class ExerciseController < ApplicationController
     if @exercise_questions.save
       standart_answer = ExerciseStandardAnswer.new
       standart_answer.exercise_question_id =  @exercise_questions.id
-      @exercise_questions.question_type == 3 ? standart_answer.answer_text = params[:exercise_choice] : standart_answer.exercise_choice_id = params[:exercise_choice]
+      @exercise_questions.question_type == 3 ? standart_answer.answer_text = translate_standard_answer(params[:exercise_choice]) : standart_answer.exercise_choice_id = translate_standard_answer(params[:exercise_choice])
       standart_answer.save
       respond_to do |format|
         format.js
@@ -239,6 +239,27 @@ class ExerciseController < ApplicationController
   end
 
   private
+  def get_complete_question(exercise,user)
+    questions = exercise.exercise_questions
+    complete_question = []
+    questions.each do |question|
+      answers = get_user_answer(question,user)
+      if !(answers.nil? || answers.count < 1)
+        complete_question << question
+      end
+    end
+    complete_question
+  end
+
+  def get_percent exercise,user
+    complete_count = get_complete_question(exercise,user).count
+    if exercise.exercise_questions.count == 0
+      return 0
+    else
+      return (complete_count.to_f / exercise.exercise_questions.count.to_f)*100
+    end
+  end
+
   def remove_invalid_exercise(course)
     exercises = course.exercises.where("exercise_name=?","")
     unless exercises.empty?
diff --git a/app/helpers/exercise_helper.rb b/app/helpers/exercise_helper.rb
index 410a9936b..6b8d8644e 100644
--- a/app/helpers/exercise_helper.rb
+++ b/app/helpers/exercise_helper.rb
@@ -1,9 +1,14 @@
 # encoding: utf-8
 module ExerciseHelper
 
+  # 单选
+  def translate_standard_answer(params)
+    answer = params.ord - 64
+  end
+
   #判断用户是否已经提交了问卷
   def has_commit_exercise?(exercise_id, user_id)
-    pu = PollUser.find_by_poll_id_and_user_id(excercise_id, user_id)
+    pu = PollUser.find_by_poll_id_and_user_id(exercise_id, user_id)
     if pu.nil?
       false
     else