A．It can reduce the number of passenger complaints．
B．It can make air travel more entertaining．
C．It can cut down the expenses for air travel．
D．It can lessen the discomfort caused by air travel．

A．Took balanced meals with champagne．
B．Ate vegetables and fruit only．
C．Refrained from fish or meat．
D．Avoided eating rich food．

A．Many of them found it difficult to exercise on a plane．
B．Many of them were concerned with their well-being．
C．Not many of them chose to do what she did．
D．Not many of them understood the program．