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。
Why does the man choose to travel by air?
A.Because it’s more comfortable.
B.Because it’s much safer.
C.Because it’s much faster.
How many times has the woman traveled by air?
A.Never.                B.Once.                   C.Twice.
Where will the speakers buy the tickets?
A.At the airport.
B.On the phone.
C.On the Internet.