<script>
var ringo = new Array(
   "りんごは赤い","りんごは植物","りんごは果物",
   "りんごは食べ物","りんごは甘い",
   "りんごは酸っぱい","りんごは甘酸っぱい"
   );

function EAR(){
   var seed = Math.floor( Math.random()* ringo.length );
   var kotoba = ringo[seed] + "よね";
   mouth.innerHTML = kotoba;
}
</script>
<div id = "mouth">　</div><br>
<input type = "button" value = "りんご" onClick = "EAR()">