In  beginning of human history,  people could only use direct verbal speech to exchange information. but this  way of communication had many shortcomings. it was not useful, for instance, when one wanted to speak to someone far away. so distance was  problem. and the spoken word could not be kept secret easily. so people wanted to invent  new method of communication.вставьте вместо пропусков артикли. ​

nazipovadk    1   26.04.2019 09:35    11