单选题
2分
![](https://static.yktong.net/courses/batches/1/796/images/3bf266d2d59adcd48f4c082ec769cc42.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/d7a3d9ddd1fd6024ce8a7e6ae4642eee.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/3bf266d2d59adcd48f4c082ec769cc42.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/d7a3d9ddd1fd6024ce8a7e6ae4642eee.jpg)
参考答案: A