document.write('标准远视力检测距离为（）。&nbsp;&nbsp;<font color="#0000CC" onclick="showMsg(\'正确答案为: A:5m\',\'center\');" title="正确答案为: A:5m">提示</font><br><input type="radio" name="vvv" id="v1" value="A" /><label for="v1">A:5m</label><BR><input type="radio" name="vvv" id="v2" value="B" /><label for="v2">B:3m</label><BR><input type="radio" name="vvv" id="v3" value="C" /><label for="v3">C:33cm</label><BR><input type="radio" name="vvv" id="v4" value="D" /><label for="v4">D:合适距离</label>');