Too much tourism can be a problem. If tourism grows too quickly，people must leave other jobs to work in the tourism industry. This means that other parts of the country's economy can suffer.

　　On the other hand，if there is not enough tourism，people can lose jobs. Businesses can also lose money. It costs a great deal of money to build large hotels，airports，air terminals，first­class roads，and other support facilities(配套设施)needed by tourist attractions. For example，a major international class tourism hotel can cost as much as 50 thousand dollars per room to build. If this room is not used most of the time，the owners of the hotel lose money.

　　Building a hotel is just a beginning. There must be many support facilities as well，including roads to get to the hotel，electricity，sewers to handle waste，and water. All of these support facilities cost money. If they are not used because there are not enough tourists，jobs and money are lost.

　　【解题导语】　本文主要讲述如果没有适当的计划，旅游业会带来的各种问题。

　　52．Which of the following do you think has been discussed in the part before this

　　selection?

　　A．It is extremely important to develop tourism.

　　B．Building roads and hotels is essential.

　　C．Support facilities are highly necessary.

　　D．Planning is of great importance to tourism.

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