单选题
2分
![](https://static.yktong.net/courses/batches/1/796/images/57658753768c138d4a19fb8b47de5682.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/57658753768c138d4a19fb8b47de5682.jpg)
参考答案: A