What if the passengers feel earache?（）
A.Tell the passenger it is very common during the flight.B.Advise the passenger to chew gums or swallow.C.Let the passenger know that it will be better soon.D.Ask the passenger to walk around.正确答案：Tell the passenger it is very common during the flight.；Advise the passenger to chew gums or swallow.；Let the passenger know that it will be better soon.