一、语言积累和运用 1.化石毫不含糊地向我们表明:过去存在的生物已经大量灭绝,在地球历史上,已经灭绝的物种远比至今仍然存在的物种要多得多,它们是进化的终端试验品。——卡尔·萨根作者说这段话的目的是告诉我们自然界存在着“自然选择”过程。但是在现代社会,自然物种 I. Language Accumulation and Use 1. Fossils show us unambiguously that the organisms that existed in the past have been extinct in large numbers. In the history of the earth, there are far more species that have become extinct than the species that still exist today. They are evolutionary. Terminal test products. - The author of Carl Sagan said that the purpose of this passage is to tell us that there is a natural selection process in nature. But in modern society, natural species