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/18/1a/181a612854d1d199dca023c85e27fc84.jpg" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/b3/c5/b3c515c847cdbad9ad733fe3f8028a48.jpg" style="width: 100%;height: auto;">