In requirements engineering, requirements elicitation is the practice of collecting the requirements of a system from users, customers and other stakeholders, In the following practices.______is rarely used in requirements elicitation.

A．brain storming

B．interview

C．questionnaire

D．Monte Carlo analysis

下列哪种不是角膜缘干细胞缺乏的原因()

A．角膜缘反复多次手术

B．巩膜炎

C．边缘性角膜炎

D．翼状胬肉

E．Stevens-Johnson综合征