A:风力发电
B:水力发电
C:火力发电
D:太阳能发电
- How long does it take to get to the airport?
- Forty minutes. But it's foggy today. I'm not sure _________ the highway will be closed soon. Let's set off earlier.
结合自己所学地图知识谈谈地图的功能有哪些?