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/ca/61/ca61956f6b1c97fac1f12592b06fee7a.png" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/55/9a/559a20dd020afb162804d8ac340c2e49.png" style="width: 100%;height: auto;">