单选题
2分
![](https://static.yktong.net/courses/batches/1/796/images/c4e95f925b0974aed9c6b96c6b65e996.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/6e2d75099cb3bde6dcc7717824bc6ce7.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/e962773247db85105b0f1c27942c795a.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/c4e95f925b0974aed9c6b96c6b65e996.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/6e2d75099cb3bde6dcc7717824bc6ce7.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/e962773247db85105b0f1c27942c795a.jpg)
参考答案: A