题目类型：
单选题
题目内容
正确答案
B
题目解析
<img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/dc/3e/dc3ed4f774c027962f230cbd7a5cb3e5.jpg" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/46/44/4644b34d94e28cb2287ff3f484850b57.jpg" style="width: 100%;height: auto;">