听力题
单选题 What kind of people don''t need a ticket?
【正确答案】 B
【答案解析】
单选题 What is the cost of a round trip?
【正确答案】 D
【答案解析】
单选题 What is the least amount of money for the tickets that machines sell?
【正确答案】 A
【答案解析】
单选题 At least how much money must be added to an old ticket for a new one?
【正确答案】 C
【答案解析】