<select id="choice">
  <option value="yes">Yesです</option>
  <option value="no">Noです</option>
</select>
<div id="box"></div>
let element = document.getElementById( "choice" ) ;
element.onchange = function(){
  let techacademy = this.value ;
  document.getElementById('box').textContent = techacademy;
}

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