听对话或独白，根据对话或独白的内容，从下面各题所给的A、B、C三个选项中选择最佳选项。每段对话或独白你将听两遍。
When will Jack’s father fly to Australia ?
A. At 7:30 am June 10th.
B. At 7:30 am July 10th.
C. At 7:15 am June 10th.
How long will the flight last ?
A. For three hours and twenty minutes .
B. For four hours and fifteen minutes .
C. For three hours and fifteen minutes .
Why does Jack’s father fly to Australia ?
A. Because Jack’s grandma is badly ill.
B. Because Jack’s grandpa is badly ill.
C. Because he wants to visit his friend.