Edit in JSFiddle

$(document).ready(function () {
    var $reviews = $('.cemil .cinner').hide();
    $reviews.eq(Math.random() * $reviews.length).show();
});

<div class="cemil">
    <div class="cinner">Lorem</div>
    <div class="cinner">Ipsum</div>
    <div class="cinner">Sit</div>
</div>