题目

听下面一段较长对话，回答以下小题。【1】On which day is there no train to New York City?A. Saturday. B. Sunday. C. Monday.【2】Which train will the man take?A. 10:30. B. 12:20. C. 15:10.【3】How much is a hard seat?A. $15. B. $6. C. $8. 答案：【答案】【1】 B 【2】 A 【3】 B 【解析】此题为听力题，解析略。【1】本题是听力试题解析略【2】本题是听力试题解析略【3】本题是听力试题解析略求下列函数的定义域:(1)y=logax2；(2)y=loga(3-2x-x2).