资源看点：本节课主要包括introduction 和reading 两部分内容。精心制作，丰富的图片且伴有视频，能很好地激发学生的兴趣，调动学生的积极性，效果很好。

Introduction-2. Vocabulary (4ms) Fill in the blanks.
A ________ is the low ground between the sides of mountains.
2. A ________ is a large area of flat low ground.
3. The ________ is the area where the land meets the sea or a lake.
4. A ________ is the side of the mountain.
5.  _______ are the steep sides of mountains at the edge of a river or the sea.
6. A ________ is the top of a mountain.
7. A ________ is an area of water surrounded by land.
8. A ________ is a small forest.
9. A ________ is a large hole in a cliff or a mountain.
10. A ________ is a large area of flat high ground..