4.听第六段材料,回答第21至第25小题.
21.When did George buy a plane?
A.5 years ago.
B.At the age of 25.
C.After he knew Mark.
22.How did George learn to fly the plane?
A.Quickly.
B.Slowly.
C.Carefully.
23.How many times had Mark traveled in a big plane?
A.Never.
B.Once.
C.Several times.
24.How long did they fly in the sky?
A.30 minutes.
B.60 minutes.
C.90 minutes.
25.What did Mark feel when he got back safely?
A.Glad.
B.Sad.
C.Angry.