An analyst who is an CFA Institute member receives an invitation from a business associate’s firm to spend the weekend in a high-quality resort, in order to abide by the Standards, the analyst should (may):（）

A. write a memo to his supervisor notifying the supervisor of the trip.

B. do all of the actions listed here.

C. accept if it is a client whose portfolio he manages.

患儿，3岁。吃瓜子时误吸入气管引起窒息。其病因是（）

A.乳食因素

B.先天因素

C.情志因素

D.意外因素

E.其他因素