参考答案： C     答案解析：
1Why does the author mention the California gold rush?
 A.To explain the need for an increased supply of gold  B.To indicate the extent of United States mineral wealth  C.To describe the mood when oil was first discovered  D.To argue that gold was more valuable than oil  
参考答案： D     答案解析：
2The author mentions all of the followings as possible products of crude oil EXCEPT _____.
 A.wax  B.gasoline  C.kerosene  D.plastic  
参考答案： A     答案解析：
3It can be inferred from the passage that kerosene was preferable to whale oil because whale oil was too_______.
 A.expensive  B.thick  C.hot  D.polluted  
参考答案： A     答案解析：
4What is the best title for the passage?
 A.Oil Refining : a historical perspective  B.The California Gold Rush: Get Rich Quickly  C.Private Property: Trespassers Will Be Prosecuted  D.Kerosene Lamps: A Light In the Tunnel  
参考答案： C     答案解析：
5According to the passage, many people initially thought that E. L. Drake had made a mistake by ________.
 A.going on a whaling expedition  B.moving to Pennsylvania  C.retiring from his oil  D.retiring from his job  
补全短文
(第46～50题，每题2分，下面的短文有5处空白，短文后有6个句子，其中5个取自短文，请根据短文内容将其分别放回原有位置，以恢复文章原貌。共10分)1、Looking into the Future Bertrand Russell, a famous philosopher, said in 1944, “The one thing the study of the past teaches us is that the future is never how people imagine it will be.”转自环 球 网校edu24ol.com转自环 球 网校edu24ol.com转自环 球 网校edu24ol.comIn 1946, physicists predicted that within twenty years, most of the world’s energy would be supplied by nuclear power. __________ (46) In 1951, a famous surgeon said that he and his colleagues were confident that “by the end of the 1950s, a cure for most if not all cancers will have been found.” In 1954, an American economist predicted Americans would go on getting richer and richer. ___________ (47).In the year 1969, an automation engineer working for Max Factor Cosmetics in Britain said that “within twenty or twenty-five years factories that today employ hundreds of workers will need only five or ten computer technicians to run them.” _____________ (48).In the early 1970s, there were many predictions that before the end of the century most homes in the United States, Europe and Japan would have computers in them. ___________ (49)Long before 1980, it was predicted that instead of letting nature and luck choose their children’s characteristics, people would have to decide which characteristics they wanted their children to inherit from them and previous generations in their families. ____________ (50)We may be able to have “undesirable” characteristics changed or destroyed through genetic therapy. Perhaps we may even begin to wish that Bertrand Russell was right when he said that hist