精选优质文档-倾情为你奉上Typical of the grassland dwellers of the continent is the American antelope, or pronghorn. 美洲羚羊，或称叉角羚，是该大陆典型的草原动物。Of the millions who saw Haleys comet in 1986, how many people will live long enough to see it return in the twenty-first century. 1986年看见哈雷彗星的千百万人当中，有多少人能够长寿到足以目睹它在二十一世纪的回归呢？ Anthropologists have discovered that fear, happiness, sadness, and surprise are universally reflected in facial expressions. 人类学家们已经发现，恐惧，快乐，悲伤和惊奇都会行之于色，这在全人类是共通的。 4. Becau
