What if the passenger feels heart uncomfortable?

A.No idea how to deal with it.

B.Ask the passenger whether he or she brings any medicine.

C.Give an announcement to see if there is a doctor on board.

D.Confirm whether the passenger has ever felt heart uncomfortable before.

正确答案：Ask the passenger whether he or she brings any medicine.；Give an announcement to see if there is a doctor on board.；Confirm whether the passenger has ever felt heart uncomfortable before.