如何使用angular js创建具有选择和非选择复选框的下拉框，如下图所示？

<div ng-app="myApp">
  <select ng-model="selectedItem" ng-options="item.name for item in items">
    <option value="">请选择</option>
  </select>
  <br>
  <label>
    <input type="checkbox" ng-model="selectedItem.selected">选择
  </label>
</div>

var app = angular.module('myApp', []);

app.controller('myCtrl', function($scope) {
  $scope.items = [
    {name: '选项1', selected: false},
    {name: '选项2', selected: false},
    {name: '选项3', selected: false}
  ];
});

<div ng-app="myApp" ng-controller="myCtrl">
  <!-- 下拉框和复选框的代码 -->
</div>