diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index fdb41c114..3c481e8b6 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -23,7 +23,7 @@ class ApplicationController < ActionController::Base
 
 	# 所有请求必须合法签名
 	def check_sign
-		if !Rails.env.development?
+		if !Rails.env.development? ||
 			Rails.logger.info("66666  #{params}")
 			# suffix = request.url.split(".").last.split("?").first
 			# suffix_arr = ["xls", "xlsx", "pdf", "zip"] # excel文件先注释
diff --git a/app/controllers/exercise_answers_controller.rb b/app/controllers/exercise_answers_controller.rb
index 158628475..31df2291e 100644
--- a/app/controllers/exercise_answers_controller.rb
+++ b/app/controllers/exercise_answers_controller.rb
@@ -26,6 +26,7 @@ class ExerciseAnswersController < ApplicationController
         end
       elsif q_type == Exercise::MULTIPLE   #多选题的
         choice_ids = params[:exercise_choice_id].present? ? params[:exercise_choice_id] : []
+        question_choice_ids = @exercise_question.exercise_choices.pluck(:id)
 
         ea_ids = ea.pluck(:exercise_choice_id)
         common_answer_ids = choice_ids & ea_ids   #已经存在的试卷选项id
@@ -37,7 +38,8 @@ class ExerciseAnswersController < ApplicationController
                 :user_id => current_user.id,
                 :exercise_question_id => @exercise_question.id,
                 :exercise_choice_id => e,
-                :answer_text => ""
+                :answer_text => "",
+                :choice_index => question_choice_ids.index(e).to_i + 1   # choice的序号
             }
             ex_a = ExerciseAnswer.new(answer_option)
             ex_a.save!
@@ -52,7 +54,8 @@ class ExerciseAnswersController < ApplicationController
             :user_id => current_user.id,
             :exercise_question_id => @exercise_question.id,
             :exercise_choice_id => choice_id,
-            :answer_text => answer_text
+            :answer_text => answer_text,
+            :choice_index => choice_id
         }
         ea_answer = ea.search_answer_users("exercise_choice_id",choice_id)
         if ea.present? && ea_answer.present?
diff --git a/app/controllers/exercises_controller.rb b/app/controllers/exercises_controller.rb
index 44bfcf03f..193ef857b 100644
--- a/app/controllers/exercises_controller.rb
+++ b/app/controllers/exercises_controller.rb
@@ -316,7 +316,8 @@ class ExercisesController < ApplicationController
             :question_number => q.question_number,
             :question_score => q.question_score,
             :shixun_id => q.shixun_id,
-            :shixun_name => q.shixun_name
+            :shixun_name => q.shixun_name,
+            :is_ordered => q.is_ordered
           }
           exercise_bank_question = current_ex_bank.exercise_bank_questions.new option
           exercise_bank_question.save!
diff --git a/app/controllers/question_banks_controller.rb b/app/controllers/question_banks_controller.rb
index 5183c7a96..bcb88ad85 100644
--- a/app/controllers/question_banks_controller.rb
+++ b/app/controllers/question_banks_controller.rb
@@ -259,7 +259,8 @@ class QuestionBanksController < ApplicationController
             :question_number => q.question_number,
             :question_score => q.question_score,
             :shixun_name => q.shixun_name,
-            :shixun_id => q.shixun_id
+            :shixun_id => q.shixun_id,
+            :is_ordered => q.is_ordered
         }
         exercise_question = new_exercise.exercise_questions.new option
         # question_type：5实训题；其他是非实训题
diff --git a/app/controllers/weapps/courses_controller.rb b/app/controllers/weapps/courses_controller.rb
index d732416ba..35a122e2c 100644
--- a/app/controllers/weapps/courses_controller.rb
+++ b/app/controllers/weapps/courses_controller.rb
@@ -108,7 +108,7 @@ class Weapps::CoursesController < Weapps::BaseController
   def change_member_roles
     @course = current_course
     tip_exception("请至少选择一个角色") if params[:roles].reject(&:blank?).blank?
-    tip_exception("不能具有老师、助教两种角色") if params[:roles].include?("PROFESSOR") && params[:roles].include?("ASSISTANT_PROFESSOR")
+    tip_exception("教师、助教角色只能二选一") if params[:roles].include?("PROFESSOR") && params[:roles].include?("ASSISTANT_PROFESSOR")
 
     params[:user_ids].each do |user_id|
       course_members = @course.course_members.where(user_id: user_id)
diff --git a/app/helpers/exercise_questions_helper.rb b/app/helpers/exercise_questions_helper.rb
index 69dee034f..1cc613bc6 100644
--- a/app/helpers/exercise_questions_helper.rb
+++ b/app/helpers/exercise_questions_helper.rb
@@ -2,9 +2,11 @@ module ExerciseQuestionsHelper
   def get_exercise_question_info(question,exercise,ex_user,ex_answerer_id)
     answered_content = []
     exercise_answers = question.exercise_answers.search_exercise_answer("user_id",ex_answerer_id)  #试卷用户的回答
-    if question.question_type <= 2
+    if question.question_type == Exercise::SINGLE || question.question_type == Exercise::JUDGMENT
+      answered_content << exercise_answers.last&.exercise_choice_id if exercise_answers.present?
+    elsif question.question_type == Exercise::MULTIPLE
       answered_content = exercise_answers.pluck(:exercise_choice_id)
-    elsif question.question_type == 3
+    elsif question.question_type == Exercise::COMPLETION
       exercise_answers.each do |a|
         u_answer = {
             "choice_id": a.exercise_choice_id,
@@ -12,10 +14,10 @@ module ExerciseQuestionsHelper
         }
         answered_content.push(u_answer)
       end
-    elsif question.question_type == 4
+    elsif question.question_type == Exercise::SUBJECTIVE
       answered_content = exercise_answers.pluck(:answer_text)
     end
-    if question.question_type == 5 && ex_user.present? && ex_user.commit_status == 1 #存在实训题，且用户已提交了的，如果实训题只做了一半就关闭，则相当于不要了
+    if question.question_type == Exercise::PRACTICAL && ex_user.present? && ex_user.commit_status == 1 #存在实训题，且用户已提交了的，如果实训题只做了一半就关闭，则相当于不要了
       if exercise.exercise_status == 3  #如果试卷已截止，则可以看到分数，否则不能查看分数
         shixun_type = 2
       else
diff --git a/app/helpers/exercises_helper.rb b/app/helpers/exercises_helper.rb
index 513f980d8..0ec1f6cb3 100644
--- a/app/helpers/exercises_helper.rb
+++ b/app/helpers/exercises_helper.rb
@@ -16,8 +16,8 @@ module ExercisesHelper
       end
 
       if q_type <= Exercise::JUDGMENT
-        if answers_content.present?   #学生有回答时,分数已经全部存到exercise_answer 表，所以可以直接取第一个值
-          ques_score = answers_content.first.score
+        if answers_content.present?   #学生有回答时,分数已经全部存到exercise_answer 表，多选题直接取第一个值，单选题和判断题选最后一个值（考虑并发）
+          ques_score = q_type == Exercise::MULTIPLE ? answers_content.first.score : answers_content.last.score
           ques_score = ques_score < 0 ? 0.0 : ques_score
           # answer_choice_array = []
           # answers_content.each do |a|
@@ -441,30 +441,42 @@ module ExercisesHelper
         end
         if q.question_type <= 2  #为选择题或判断题时
           if answers_content.present?   #学生有回答时
-            answer_choice_array = []
-            answers_content.each do |a|
-              answer_choice_array.push(a.exercise_choice.choice_position)  #学生答案的位置
-            end
-            user_answer_content = answer_choice_array.sort
-            standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
-
-            #TODO: 旧版多选题的标准答案是放在一个里面的，新版又做成了一个题有多个标准答案（exercise_choice_id存放的是标准答案的位置..）
-            if q.question_type == 1 && standard_answer.size == 1
-              standard_answer = standard_answer.first.to_s.split("").map(&:to_i).sort
-            end
-
-            if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
-              if standard_answer.size > 0
+            if q.question_type == 0 || q.question_type == 2 ## 单选、判断题的算分与多选题分开计算
+              user_answer = answers_content.last.exercise_choice.choice_position
+              standard_answer = q.exercise_standard_answers.first&.exercise_choice_id
+              if standard_answer.present? && user_answer == standard_answer
                 q_score_1 = q.question_score
-                # q_score_1 = (q.question_score.to_f / standard_answer.count)   #当多选答案正确时，每个answer的分数均摊。
+                score1 = score1 + q.question_score
               else
-                q_score_1 = 0.0
+                q_score_1 = -1.0
               end
-              answers_content.update_all(:score => q_score_1)
-              score1 = score1 + q.question_score
+              answers_content.last.update!(score: q_score_1)
             else
-              answers_content.update_all(:score => -1.0)
-              score1 += 0.0
+              answer_choice_array = []
+              answers_content.each do |a|
+                answer_choice_array.push(a.exercise_choice.choice_position)  #学生答案的位置
+              end
+              user_answer_content = answer_choice_array.sort
+              standard_answer = q.exercise_standard_answers.pluck(:exercise_choice_id).sort  #该问题的标准答案，可能有多个
+
+              #TODO: 旧版多选题的标准答案是放在一个里面的，新版又做成了一个题有多个标准答案（exercise_choice_id存放的是标准答案的位置..）
+              if q.question_type == 1 && standard_answer.size == 1
+                standard_answer = standard_answer.first.to_s.split("").map(&:to_i).sort
+              end
+
+              if user_answer_content == standard_answer  #答案一致,多选或单选才给分，答案不对不给分
+                if standard_answer.size > 0
+                  q_score_1 = q.question_score
+                  # q_score_1 = (q.question_score.to_f / standard_answer.count)   #当多选答案正确时，每个answer的分数均摊。
+                else
+                  q_score_1 = 0.0
+                end
+                answers_content.update_all(:score => q_score_1)
+                score1 = score1 + q.question_score
+              else
+                answers_content.update_all(:score => -1.0)
+                score1 += 0.0
+              end
             end
           else
             score1 += 0.0
diff --git a/app/helpers/shixuns_helper.rb b/app/helpers/shixuns_helper.rb
index 655a7ed04..451d4a9a4 100644
--- a/app/helpers/shixuns_helper.rb
+++ b/app/helpers/shixuns_helper.rb
@@ -1,12 +1,12 @@
 module ShixunsHelper
 
 	def level_to_s(level)
-		%W(初级 中级 高级 顶级)[level-1]
+		%W(初级 中级 中高级 高级)[level-1]
 	end
 
   #难度
 	def diff_to_s(trainee)
-		%W(初级学员 中级学员 高级学员 顶级学员)[trainee-1]
+		%W(初级学员 中级学员 中高级学员 高级学员)[trainee-1]
 	end
 
   #1. 未发布
@@ -24,6 +24,8 @@ module ShixunsHelper
 			"已发布"
 		when 3
 			"已关闭"
+		when -1
+			"已删除"
 		end
 	end
 
diff --git a/app/models/shixun.rb b/app/models/shixun.rb
index c16c4df4e..30c27ba94 100644
--- a/app/models/shixun.rb
+++ b/app/models/shixun.rb
@@ -276,8 +276,8 @@ class Shixun < ApplicationRecord
     case trainee
     when 1 then '初级学员'
     when 2 then '中级学员'
-    when 3 then '高级学员'
-    when 4 then '顶级学员'
+    when 3 then '中高级学员'
+    when 4 then '高级学员'
     else ''
     end
   end
@@ -286,8 +286,8 @@ class Shixun < ApplicationRecord
     case trainee
     when 1 then '初级'
     when 2 then '中级'
-    when 3 then '高级'
-    when 4 then '顶级'
+    when 3 then '中高级'
+    when 4 then '高级'
     else ''
     end
   end
diff --git a/app/services/shixun_search_service.rb b/app/services/shixun_search_service.rb
index 071b9f478..323804e95 100644
--- a/app/services/shixun_search_service.rb
+++ b/app/services/shixun_search_service.rb
@@ -43,7 +43,6 @@ class ShixunSearchService < ApplicationService
       @shixuns = @shixuns.where(trainee: params[:diff])
     end
 
-    Rails.logger.info("search_shixun_ids: #{@shixuns.pluck(:id)}")
     Shixun.search(keyword, search_options)
   end
 
@@ -53,7 +52,7 @@ class ShixunSearchService < ApplicationService
 
     order =
         if sort_str == "wechat_myshixuns_count"
-          {"is_wechat_support" => "desc", sort_str => order_str}
+          {"is_wechat_support" => "desc", "myshixuns_count" => order_str}
         else
           {sort_str => order_str}
         end
diff --git a/db/migrate/20200115020230_add_choice_index_to_exercise_answers.rb b/db/migrate/20200115020230_add_choice_index_to_exercise_answers.rb
new file mode 100644
index 000000000..cb518bb42
--- /dev/null
+++ b/db/migrate/20200115020230_add_choice_index_to_exercise_answers.rb
@@ -0,0 +1,17 @@
+class AddChoiceIndexToExerciseAnswers < ActiveRecord::Migration[5.2]
+  def change
+    add_column :exercise_answers, :choice_index, :integer, default: 1
+
+    multi_questions = ExerciseQuestion.where(question_type: 1)
+    multi_questions.includes(:exercise_choices, :exercise_answers).find_each do |question|
+      exercise_answers = question.exercise_answers
+      exercise_answers.find_each do |answer|
+        choice_index = question.exercise_choices.pluck(:id).index(answer.exercise_choice_id).to_i + 1
+        answer.update_column('choice_index', choice_index)
+      end
+      puts "multi_questions: #{question.id}"
+    end
+
+    ExerciseAnswer.joins(:exercise_question).where(exercise_questions: {question_type: 3}).update_all("choice_index = exercise_choice_id")
+  end
+end
diff --git a/db/migrate/20200115030135_add_choice_index_uniq_index_to_exercise_answers.rb b/db/migrate/20200115030135_add_choice_index_uniq_index_to_exercise_answers.rb
new file mode 100644
index 000000000..d870fba7f
--- /dev/null
+++ b/db/migrate/20200115030135_add_choice_index_uniq_index_to_exercise_answers.rb
@@ -0,0 +1,13 @@
+class AddChoiceIndexUniqIndexToExerciseAnswers < ActiveRecord::Migration[5.2]
+  def change
+    sql = %Q(delete from exercise_answers where (exercise_question_id, user_id, choice_index) in
+            (select * from (select exercise_question_id, user_id, choice_index from exercise_answers group by exercise_question_id, user_id, choice_index having count(*) > 1) a)
+            and id not in (select * from (select max(id) from exercise_answers group by exercise_question_id, user_id, choice_index having count(*) > 1 order by id) b))
+    ActiveRecord::Base.connection.execute sql
+
+    add_index :exercise_answers, [:exercise_question_id, :user_id, :choice_index], name: 'exercise_user_choice_index', unique: true
+
+    remove_index :exercise_answers, name: :exercise_choice_index
+
+  end
+end