it...whether
question:
1.Why some poeple question the existence change travel industry?
2.Why is travel called am industry now?
comprises...of 由。。。組成。
categorized 由。。。分類。
tend to reflect 傾向，傾向于。
be involved in 涉及與。。。
have integrated。。。with 與。。。融洽。
have 。。。power over 有權(quán)決定。。。
do feasibility study 作可行性研究
hospitality 接待部門 distribution （旅游銷售部門)
transportation-airlines，holtels and travel agency are directed travel industry .
their support are tour orgnizer, tourism issue,hotel management.