what are three inventions that contributed to the spread of learning?

what are the big three? What are three kinds of culture? What are three big industries in Ontario? I'm sorry three.和What are you sorry for? what class are you in?（用class three回答） what are tne three braches of the US federal government? What are the three words that Peaple often say What are three things you dislike about computers? what are three types of closing sales hospitality? What are the three major national partied in the UK. What are two and three 这句话对吗? what are the three features of technology transfer?why? what are the three social problems facing Eastern Europe? what are three main things that operating system handles what are three important features of a modern economy 1.What are the three children's names?的答语 What are the three legal remedies a court may order? what class are you in? 回答（ ） A：class B：class three C：Class Three D：Class three