L1 P14 Why does the author tell s not to be afraid to ask stupid questions？ The author thinks that many apparently naive inquiries like why grass is green， or why the sn is round， or why we need 55，000 unclear weapons in the world ——are really deep questions. He says when you try to get the answers， you will gain deep understanding of the things. Its also important to know， as well as you can， what it is that you dont know， and asking questions is the way. He also tell us to ask stupid questions requires courage on the part of the asker and knowledge and patience on the part of the answers. And dont confine your learning to schoolwork. Discuss ideas in depth with friends. Its much brave to ask questions even when theres a prospect of ridicule than to suppress your questions and become deadened to the world around you.

　　L2 Icons P30 What are the factors to shift the hero-worship to the celebrity-worship？ The new forms of media——photography， moving pictures， radio and television are the main factors. The reproduction of photos in newspapers turned famous people into celebrities whose dress， appearance， and personal habits were widely commented upon. Slowly， the focus of public attention began to shift away from knowing what such people did to knowing what looked like. The shift was accelerated by the arrival of moving pictures. Between 1901 and 1914， 74 percent of the magazine articles about famous people were about political leaders，inventors， inventors， professionals， and businessmen. After 1922， however， most articles were about movie stars. With the arrival of television， the faces of the stars became as familiar as those we saw across the breakfast table. We came to know more about the lives of the celebrities than we did about most of the people we know personally. Less than seventy years after the appearance of the first movimg pictures， the shift from hero-worship to celebrity-worship was complete.

　　L3 GO-GO AMERICAN P46 What is the Americ