题目

    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'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 a将规格都是“220V  200W”的一台电风扇、一台电视机和一把电烙铁，分别接入家庭电路中，通电时间相同，下列有关电流通过它们产生热量的说法中，正确的是   A、电风扇产生的热量最多            B、电视机产生的热量最多 C、电烙铁产生的热量最多            D、三者产生的热量一样多