在人类文明发展的进程中,最初的两个阶段可能是原始武器的发明和火的发现,但没有人确切的知道,人类是在什么时候学会利用火的。
12) Animal have a few cries that serve as signals,but even the highest apes haven't been found able to pronounce w 公共英语等级考试四级英译汉试题荟萃2 标签: