单选题
2分
![](https://static.yktong.net/courses/batches/1/796/images/4b249761c6e444e6a7b7bb1a57967fc0.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/8003c9b3a80aed16d904e4e48f723a66.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/3d3ff2304a86c58259e1a97b1ca57412.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/4b249761c6e444e6a7b7bb1a57967fc0.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/8003c9b3a80aed16d904e4e48f723a66.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/3d3ff2304a86c58259e1a97b1ca57412.jpg)
参考答案: B