Select multiple can't work in ionContent

ionic-v1
1

I try to add a select element in ion-content, but I can’t click any item at the element.
Could you tell me what can I do?

<ion-view title="Playlist">  <ion-content class="has-header">
<h1>Playlist</h1>
<select multiple="multiple" ng-model="val" ng-options="answer for answer in ListAnswer"></select>
2

OK~I find the problem, that I ran [ionic serve] to show my application on my browser.
When I deploy my app to device, the element can work, so I think Ionic change the behavior.