单项选择题

By saying "... those raw materials exist already in abundance in every nation", the author is referring to ______.

A．hosts and staff to welcome visitors
B．people, the environment and culture
C．the capital used to build the tourism industry
D．the environmental resources to build up tourism
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单项选择题
The author's purpose of writing this passage is to ______.
A．argue that travel is an important industry
B．show travel industry's important role in nation building
C．encourage people in the tourism industry to do more for poverty
D．point out that the travel industry has social, cultural as well as economic value
单项选择题
The reason tourism benefits a country even more than traditional industries is that it ______
A．requires much less capital
B．has more of a cultural benefit
C．has more potential to lead to other industries
D．uses less resources which harm the environment
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