<html><body><h1>option selected 属性</h1><label for="cars">请选择一个汽车品牌：</label><select id="cars"> <option value="audi">奥迪</option> <option value="byd">比亚迪</option> <option value="geely">吉利</option> <option value="volvo" selected>沃尔沃</option></select></body></html>