根据上下文补全对话，每空一个单词。

A: Excuse me.  Where's the train 1. ________?

B: Well, it's about three 2. _______  from here.

A: It's a little 3. ________.Can I take a bus?

B: Yes. You can take a No.  2 bus.

A: Can you tell me where the bus 4. _______  is?

B: Yes. Go along this road. It 5. ________you about five minutes.

自动驾驶系统的电源来自（）

A、PS1和PS2

B、PE

C、XS1和XS2

D、XE