在世界古代史上充当在东西方文化交流的中介角色，并为东西文化的交流作出了巨大贡献的是(     )

为了节能减排，近期纯电动出租车正式上路运行．某地纯电动出租车的运价为3公里以内10元；超出3公里后每公里2元；单程超过15公里，超过部分每公里3元．小周要到离家10公里的博物馆参观，若他往返都乘坐纯电动出租车，共需付车费____ 元．

阅读理解

   Look! This is my new schoolbag. It's big. It's blue and white. I have an English book, a Chinese book, a math book, three notebooks and a pencil-case in it. In my pencil-box, you can see a ruler, two pens, seven pencils and a notebook. Oh, where is my schoolbag? It's on my chair.