我来填一填。

一个数，它的百万位和百位上的数字都是5，其余各位上都是0，这个数写作____。

根据下面对话情景，在每个空白处填上一个适当的单词，使对话的意思连贯、完整。

A: Hi, excuse me.

B: Yes. How can I ____  you?

A: I'm new in town. Where is the Science Museum, please?

B: Go along Center Street and ____ right on Main Street. Then you'll see it on your left. It's across from the park.

A: Is it far from here?

B:____ , it's quite far from here. And you can take a bus.

A: Which ____  can I take?

B: The No. 5 bus.

A: Is____ a bus stop near here?

B: Yes, there is. I can walk with you.

A: Oh, that's great! Thanks so much.

B: No problem.

关于下图中①、②两幅等高线地形图的说法，正确的是（    ）