题目类型：
单选题
题目内容
正确答案
A
题目解析
<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/d3/3a/d33a99c2af73962d711d070b4a0d020e.png" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/e7/2d/e72dd39448d2081a7784ccab48a11cca.png" style="width: 100%;height: auto;">