人类的祖先———原始人大约诞生在两三百万年前,他们最初生活在原始森林里,后来一部分人离开森林,住进了山洞,山洞成为他们最早的“房子”。经过漫长的岁月,原始人慢慢从山洞里搬出来,在平地上盖起房子。这些用泥巴、茅草和树枝搭建的房子,就是人类最早的房子。原始人最早是利 The ancestors of mankind --- primitives were born approximately two to three million years ago. They first lived in primeval forests. Later, some of them left the forest and lived in caves. Their caves became their earliest “houses.” After a long period of time, the primitives slowly moved out of the cave and built houses on the ground. These houses, built of mud, thatch and branches, are the earliest houses of mankind. Primitive people are the earliest