public List<?> doSelect(int recordStart, int sizePage, PageConfig pageConfig) {
		List<Question> newlist = new ArrayList<Question>();
		HttpServletRequest request=pageConfig.getRequest();
		Long surveyId=Long.valueOf(request.getParameter("sid"));
		if (this.list_question == null)
			list_question = this.listAllQuestion(surveyId,"desc");
		for (int i = recordStart; i < recordStart+sizePage; i++){
			if(i<list_question.size())
				newlist.add(list_question.get(i));
			else
				break;
		}
		return newlist;
	}