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/16/ca/16ca7706d4301a63d2c5d6403de9e4a5.png" style="width: 100%;height: auto;"><img alt="" src="https://file.gaojiufeng.cn/learnAppQuestion/2a/50/2a508b493c99d2d089566b96234432fc.png" style="width: 100%;height: auto;">