it...whether 

question:

1.Why some poeple question the existence change  travel industry?

2.Why is travel called  am industry now?

comprises...of 由。。。组成。

categorized 由。。。分类。

tend to reflect 倾向，倾向于。

be involved in 涉及与。。。

have integrated。。。with 与。。。融洽。

have 。。。power over 有权决定。。。

do feasibility study 作可行性研究

hospitality 接待部门 distribution （旅游销售部门)

transportation-airlines，holtels and travel agency are directed travel industry .

their support are tour orgnizer, tourism issue,hotel management.