下图是某城市发展阶段图，据图完成题。
在《敕勒歌》中“天苍苍，野茫茫，风吹草低见牛羊”描述的是哪个地形区的景色（ ）
— You're welcome. And you help me a lot ____ my maths, right?
—Yes. She ______ shopping on the Internet now.
