6．听下面一段材料，回答15-17题．
15．When will Jack's father fly to Australia？
A．At 7：30am June 10th．
B．At 7：30am July 10th．
C．At 7：15am June 10th．
16．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．
17．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．
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