¡¡¡¡ÂÖ×ÓÊÇʲôʱºò·¢Ã÷µÄÄØ£¿×îÔçµÄÓÃ;ÓÖÊÇʲôÄØ£¿ÕâЩÎÊÌâÎÞÈËÄܻش𡣵«ÊÇÎÒÃÇÖªµÀ£¬ÂÖ×Ó´æÔÚµÄʱ¼äÒѾ³¬¹ý5 500Äê¡£
¡¡¡¡1£®C¡¡Ï¸½ÚÀí½âÌâ¡£Óɵڶþ¶ÎµÚËľä“This could be because animals did a perfectly good job of carrying farming tools and humans around.”¿ÉÖª£¬¶¯ÎïÔÚÔËÔØÅ©¾ßºÍÈËÕâÒ»·½ÃæÆðÁ˺ÜÖØÒªµÄ×÷Óã¬ÕâÊÇÂÖ×ÓһʱûÓÐÁ÷ÐеÄÔÒò¡£