[单选题]根据《民用航空安全检查规则》第56条,对进入民用运输机场控制区的工具、物料或者器材,含有民航禁止运输物品或限制运输物品的,民航安检机构应当要求其同时提供()同意证明。
A.公共航空运输企业
B.民用运输机场管理机构
C.民航局
D.国务院

{{B}} Questions 57 to 61 are based on the following passage.{{/B}}
Recently, a student used his Personal Digital Assistant (PDA) to film a female teacher berating (训斥) and tearing the work of a classmate. The public discussion that the incident caused was confined initially to the virtual community in which the video clip was posted. However, when it came to the media’s attention, it quickly became a major topic in the education circles. The reactions so far suggest that the focus of the debate has been on one question: Whom to blame
Teachers who are anxious to defend their professional integrity have tried to put the blame on the students. They cited intrusion of privacy as the reason for their request to the Ministry of Education (MOE) to ban PDAs in schools. On the other hand, some parents and students have taken a different position. They feel that the teacher is also at fault, Caught up in the war of words
A. criticize the students’ behavior in the classroom
B. criticize the teachers’ way of teaching
C. discuss the potential problems of educational system
D. emphasize the use of PDA in the classroom