已知某二叉树的先序遍历序列为ABDCEFG、中序遍历序列为BDACFGE，则该二叉树

Mr. Green asked a lot of questions about the buses. But Sam couldn’t answer them. Here’s a timetable. Friends, after you read it, can you answer Mr. Green’s questions?

Timetable
STOP	BUS 1	BUS 2	BUS 3源]	BUS 4
Ferry	6:00	6:30	7:00	7:30
Old street	6:10	6:40	7:10	7:40
Park	6:25	6:55	7:25	7:55
New Street	6:30	7:00	7:30	8:00
Hotel	6:35	7:05	7:35	-
Playground	6:40	7:10	7:40	8:05
Hospital	7:00	-	8:00	8:25源]
Market	7:00	7:30	8:10	8:35

1. How many stops are there between the Ferry and the Market?
A. Five            B. Six            C. Seven            D. Eight
2. How often does the bus get to the New Street?
A. Every half an hour  B. Every twenty minutes  C. Every ten minutes D. No answer
3. At what time does Bus Four leave the Hotel?
A. Seven fifty-five   B. Eight o’clock   C. Five minutes past eight   D. No answer
4. I work in the hospital. It is quite near the bus stop. Only three minutes’ walk. I must reach the hospital at eight o’clock. Which bus should I take?
A. The first bus    B. The second bus     C. The third bus    D. The fourth bus
5. I start my work at 8:00. I have breakfast at 7:30. Before breakfast, I must get to the market. Which bus should I take?
A. The first bus.    B. The second bus.   C. The third bus.    D. The fourth bus.