《铁路旅客运输管理规则》中规定，电气化区段停站不得（）和严禁（）作业。
参考答案：冲刷车皮；攀登车顶
患者女，32岁。患急性再生障碍性贫血入院，给予丙酸睾酮治疗，应定期检查哪项（）
A.肝功能
B.血压
C.尿常规
D.肾功能
E.X线摄片
Laura _____ in this school since she came to China. [ ]
A. is studying
B. was studying
C. will study
D. has studied
