1 .翻译成汉语 replace 就是“取代”的意思.根据短文选B
2 .根据People in different cultures think it good for them to share a popular language.They can quickly share ideas and work together.Knowing the same language means easier communication and is a basis for trust.可以断定选B
3 .A The future of the world’s languages depends on our actions now.Will we protect endangered languages or allowed them to quietly disappear?如果不保护的话那么不流行的语言就会默默的消失.