题目类型：
单选题
题目内容
正确答案
C
题目解析
<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/db/0c/db0c3afb55e8d6525c084b01cfc70efc.jpg" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/a4/4c/a44c9bd6aa61261c9526ba0a50a21491.jpg" style="width: 100%;height: auto;">