单选题
2分
![](https://static.yktong.net/courses/batches/1/796/images/bcabf8f64209ca483704f4e6267aaa77.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/ab2a9b76becab70110c494c929d95b36.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/0c70dea60c7027ea314944e610c2a8d9.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/bcabf8f64209ca483704f4e6267aaa77.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/ab2a9b76becab70110c494c929d95b36.jpg)
![](https://static.yktong.net/courses/batches/1/796/images/0c70dea60c7027ea314944e610c2a8d9.jpg)
参考答案: C