切换下一个元素(jquery)

HTML:

<div class="interview">
    <h4>Interview</h4>
    <a href="#" class="question">This is question 1?</a>
    <div class="answer">This is an answer!</div>
    <a href="#" class="question">This is question 2?</a>
    <div class="answer">This is an answer!</div>
    <a href="#" class="question">This is question 3?</a>
    <div class="answer">This is an answer!</div>
</div>

jQuery:

if ($('interview')[0]) {
    $('interview .question').toggle(function () {
        $(this).next('.answer').slideIn();
    },
    function () {
        $(this).next('.answer').slideOut();
    });
}

…我不明白为什么它不起作用。