下拉框结构如下，我需要选择的是new：

html为：

<select id="condition_type" name="condition_type" class="notification-required notification-required-unknown">
    <option value="">
            - Select -</option>
    <option value="new, new">
            New</option>
    <option value="used, like_new">
            Used - Like New</option>
    <option value="used, very_good">
            Used - Very Good</option>
    <option value="used, good">
            Used - Good</option>
    <option value="used, acceptable">
            Used - Acceptable</option>