一、阅读下面的说明文 ,完成 1— 5题。生命的摇篮①我们人类祖祖辈辈在陆地上生活 ,总是把陆地看作自己的故乡。但是不要忘记 ,我们很远的祖先却生活在海洋。②大约在 32亿年以前 ,最原始的生命在海洋里诞生。根据化石所见 ,这些原始的生命和今天的细菌相似。它们以海洋里自然 First, read the following explanatory text to complete the 1 - 5 questions. The cradle of life 1 Our human ancestors lived on land for generations, always treating the land as their hometown. But don’t forget that our far ancestors lived in the ocean. 2 About 3.2 billion years ago, the most primitive life was born in the ocean. According to the fossils, these primitive lives are similar to today’s bacteria. They take nature in the ocean