题目

科学家发现C60后，近年又合成了许多球形分子(富勒烯)，如C50、C70、C120、C540等，它们互称为(    ) A.同系物                 B.同分异构体                C.同素异形体               D.同位素 答案：解析：本题要求掌握、理解和应用同位素、同系物、同素异形体、同分异构体等概念。根据这些概念可判断C正确。答案：C听下面一段对话，回答第1-4题。1. What do the speakers talk about?A. Finding parttime jobs.      B. Finding fulltime jobs.C. Working as volunteers. 2. According to the woman，what should the man do at first?A. Find out about his own ability.B. Use his resources if necessary.C. Decide on the type of job. 3. Where does the woman advise the man to find “wanted” ads?A. From companies.      B. In newspapers.C. From his teachers. 4. What kind of information should the man prepare for an interview?A. Information about the interviewer.B. Information about the company and selfintroduction.C. Information about his relations.