题目类型：
单选题
题目内容
正确答案
A
<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/36/93/3693136d6bfa50da2ceaed715f0a5c81.jpg" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/a1/66/a166c5b9a414acdb5bf10720200e5b2a.jpg" style="width: 100%;height: auto;">