听力原文：

G: What time does your train for Tianjin leave, Lee Kai?

B: I forgot it. Let me check it on my mobile phone. Oh, it leaves at 2:30.

G: Do you know whether the train will stop at Shijiazhuang?

B: No, but it will pass by Shijiazhuang.

G: Do you change trains at Beijing West Railway Station?

B: No, this is a direct train.

G: When does your train get to Tianjin?

B: Tomorrow morning.

G: Wish you a good journey!

B: Thank you.

Question: Why doesn’t Lee Kai change trains at Beijing West Railway Station?

参考答案: 

Because it’s a direct train to Tianjin.