阅读理解

　　William Jefferson Clinton(威廉·杰斐逊·克林顿)was born in a small town of America. He was born on 19th August, 1946. He was president of the USA from 1993 to 2001.

　　Wang Fei is a teacher. He was born in Shanghai and he teaches in a middle school. He is very friendly to his students. He lives in a big room with a TV, a kitchen, a bedroom and a bathroom. He is very young but very nice.

目前许多国家都在研制磁悬浮列车，如图5所示．我国拥有全部自主知识产权的第一条磁悬浮列车试验线已建成，且实现了2000千米无故障运行．一种磁悬浮列车的车厢和铁轨上分别安放着磁体，车厢用的磁体大多是通有强大电流的电磁铁．现有下列说法：

①磁悬浮列车利用了同名磁极互相排斥

②磁悬浮列车利用了异名磁极互相排斥

③磁悬浮列车消除了车体与轨道之间的摩擦

④磁悬浮列车增大了车体与轨道之间的摩擦

正确的组合是（　　）

谈到西汉的政权建设，史家常以“汉承秦制”作论。下列项中能体现该论断的是（   ）

我们明确自己的人生目标后，在实现过程中，还要有一定的灵活性。这是因为（   ）
①当时确定的目标可能与实际情况不符            ②当时确立的目标不远大
③实现目标所需要的主客观条件变化了            ④当初确立目标时考虑的不成熟，出现失误