selenium 下拉框 单选 复选定位

参考https://blog.csdn.net/weixin_40008033/article/details/117801329；https://blog.csdn.net/Zhen_learn/article/details/104387821?spm=1001.2014.3001.5502；https://blog.csdn.net/Zhen_learn/article/details/104388342?spm=1001.2014.3001.5502