单项选择题
A．have been to the four comers of the earth B．travel around the world on business C．want to explore the eight airlines D．need support all along the way
A．feeling pain is part of our life B．pain should be avoided at all costs C．feeling pain can be an interesting thing D．magic power is essential for reducing pain
A．a travel agency B．a union of airlines C．a series of tourist attractions D．the title of a flight program