A.Language was the first invention of mankind. B.There was no greater invention than language. C.Most of man's inventions depended on language. D.There were so many languages in the world. 24. A.Communication through language is unlimited. B.Only man uses language. C.There are no other means of communication. D.Man's inventions are limited. 25. A.It is passed on to the next generation in genes. B.It is stored in computers. C.It is passed on to the next generations through language. D.The young people start their research before the old people die.