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<!DOCTYPE html> <html> <body> <h2>预选选项</h2> <p>您可以使用 selected 属性预选一个选项：</p> <form action="/action_page.php"> <label for="cars">选择一辆车：</label> <select id="cars" name="cars"> <option value="volvo">Volvo</option> <option value="saab">Saab</option> <option value="fiat" selected>Fiat</option> <option value="audi">Audi</option> </select> <input type="submit"> </form> </body> </html>