Every day in China, about 200 million children go to school. Many of them take school buses to school and back home. Most of the time, the school buses are very safe for them. But sometimes they are also dangerous.

    Several years ago, a serious accident happened to a nine – seat minibus in November in Gansu. There were 62 children inside, and 21 of them died.

    What should we do to keep us safe on the road? First, we should wait for the school bus on time at the right place when we are going to school or coming back home. Second, we shouldn't run or fight on the bus when it is going. Third, we mustn't try to get off when it is moving. Last, don't get on the bus if it is overloaded(超载).

    Our government(政府)also makes rules for school buses. Under the new rules, school buses have a speed limit of 80km per(每)hour on highways and 60km per hour on normal roads. While on the road, other cars must let school buses go first.

根据材料内容选择最佳答案。

阅读材料结合所学知识，回答问题。

材料一：在工业化时代，世界领导国必须是拥有海上霸权的国家……19世纪的世界领导者是英国，在英国达到鼎盛时期的1860年前后，其现代化工业的生产能力相当于世界的40%～50%，欧洲的55%～60%……大英帝国号称日不落帝国，它的殖民地遍布世界各大洲。

材料二：美国独立战争结束了英国的殖民统治，实现了国家的独立。南北战争维护了国家的统一，在19世纪末，美国跃居资本主义世界首位……从现在起直到2030年或2050年，美国将是惟一的世界领导国，这是毫无疑问的。

材料三：战后，美国国民生产总值达到了前所未有的水平。从1940年的2270亿美元上升到1945年的3550亿美元。到1945年，美国占有西方世界工业生产的53.4%、外贸的32.4%，经济实力空前膨胀。

请回答：