题目内容：

Without proper planning，tourism can cause problems.For example，too many tourists can crowd public places that are also enjoyed by the inhabitants of a country.If tourists create too much traffic，the inhabitants become annoyed and unhappy.They began to dislike tourists and to treat them impolitely.They forget how much tourism can help the country's economy.It is important to think about the people of a destination country and how tourism affects them.Tourism should help a country keep the customs and beauty that attract tourists.Tourism should also advance the wealth and happiness of local inhabitants.

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.Business can also lose money.It costs a great deal of money to build large hotels，airports，air terminals，first­class roads，and other support facilities 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 owner 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.

1.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 hotel is essential.

C. Support facilities are highly necessary.

D. Planning is of great importance to tourism.

2.Too much tourism can cause all these problems EXCEPT        ．

A. a bad effect on other industries

B. a change of tourists' customs

C. over­crowdedness of places of interest

D. pressure on traffic

3.It can be inferred from the text that        ．

A. the author doesn't like tourism developing so fast

B. local people will benefit from tourist attractions

C. other parts of a country's economy won't benefit from tourism much

D. we can't build too many support facilities

4.The author thinks it is good for local people to know that tourism will        ．

A. waste a lot of money

B. weaken their economy

C. help establish their customs

D. help improve their life