单项选择题
A．The Origin of Life on Earth B．Life Forms on Earth C．The Discovery of Life on Earth D．The Preservation of the Past Life on Earth
A．a record calling on people to conserve nature B．a rule worked out by the United Nations C．an important book published in 1970 D．an idea that nobody would accept
A. What’s the matter B. I’m sorry to hear that. C. He simply hates me. D. Anyway, cheer up! E. Yeah, but it’s very hard to find jobs now. F. I’m all right. G. Let me alone. H. How are you