选字前面选，后面答案

package com{
    import flash.display.MovieClip;
    import flash.display.SimpleButton;
    import flash.events.MouseEvent;
    import flash.text.TextField;

    public class SecondFrame extends MovieClip {

        private var thisMc:MovieClip;
        private var btnMc:MovieClip;
        public static var answerArr:Array = [];
        private var arr:Array = ["A","B","C","D"];

        private var nextBtn:SimpleButton;
        public function SecondFrame(_thisMc:MovieClip,_btnMc:MovieClip) {
            thisMc = _thisMc;
            btnMc = _btnMc;
            btnMc.addEventListener(MouseEvent.CLICK,btnMcFun);
            for (var i:uint =0; i<btnMc.numChildren; i++) {
                btnMc.getChildAt(i).alpha = 0;
            }

        }
        private function btnMcFun(e:MouseEvent) {
            if (e.target.alpha == 0) {
                e.target.alpha = 1;
            } else {
                e.target.alpha = 0;
            }

        }
        public function nextFun(_nextBtn:SimpleButton ) {
            nextBtn = _nextBtn;
            nextBtn.addEventListener(MouseEvent.CLICK,onNextBtn);
        }
        private function onNextBtn(e:MouseEvent) {

            for (var i:uint =0; i<btnMc.numChildren; i++) {
                if (btnMc.getChildAt(i).alpha == 1) {
                    answerArr.push(i);
                }
            }
            if (answerArr.length != 0) {
                thisMc.nextFrame();
                btnMc.removeEventListener(MouseEvent.CLICK,btnMcFun);
                nextBtn.removeEventListener(MouseEvent.CLICK,onNextBtn);
            } else {
                answerArr = [];
            }
        }

    }

}

//答案//////////////

        private var arr2:Array = [10,15];
        public function Answer2(_mc:MovieClip ) {
            _mc["circle"].alpha = 0;
            if (SecondFrame.answerArr.length != arr2.length) {
                _mc["circle"].alpha = 1;
                _mc["right"].nextFrame();
                for (var i:uint=0; i<SecondFrame.answerArr.length; i++) {
                    _mc["answerMc"].getChildAt(SecondFrame.answerArr[i]).alpha = 1;
                }
            } else {

                for (var j:uint=0; j<arr2.length; j++) {
                    if (SecondFrame.answerArr[j] == arr2[j]) {
                        if(j==arr2.length -1){
                        funnum1()}
                    } else {
                        _mc["circle"].alpha = 1;
                        _mc["right"].nextFrame();
                    }
                }
            }


        }