题目

根据短文内容，从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 All languages change over time, but some change at a faster rate than others. The most important factors are the number of people who speak a language, where they live and whether they move around, the importance of the language for world trade and communication, and changes in technology. However, today English is the most widely used language in the world. English is spoken by about 350 million people as a first language in countries such as Great Britain, the United 从年龄结构来看，人口迁移一般以 A.青年为主　　　　　　　　　　　　 B.老年为主 C.少年为主　　　　　　　　　　　　 D.少年和老年为主