题目

下列现象与电化学腐蚀无关的是（   ） A . 黄铜（铜锌合金）制作的铜锣不易产生铜绿 B . 生铁比软铁芯（几乎是纯铁）容易生锈 C . 铁质器件附有铜质配件，接触处容易生铁锈 D . 银质奖牌放置久了表面变暗 答案：D 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 begin to dislike tourists and to treat them impolitely. They forget how much tourism can help the country and how tourism affects them. Tourism should help a country keep the customs and beauty that attract tourists. Tourism should also advance the well-being (health 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. Businesses can also lose money. It costs a great deal of money to build large hotels, airports, air terminals, first-class 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 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（阴沟） to handle waste, arid water. All of these support facilities cost money. If they are not used because there are not enough tourists, jobs and money are lost.【小题1】 Which of the following has most probably been discussed in the paragraph that goes before the passage?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.【小题2】 Too much tourism can cause all these problems EXCEPT ______.A．a bad impact on other industriesB．A change of tourists’ customsC．overcrowdedness of places of interestD．pressure on traffic【小题3】 It is good for local people to be well aware that tourism will _____.A．use up a large amount of waterB．weaken their economyC．help establish their traditionsD．help improve their life