阅读下列材料，从各题所给的A.B.C.D.四个选项中，选出一个最佳答案。

Dear Jenny,

I am in Beijing, China now, but my parents are in the USA. I live with my broth er Peter. Beijing is big and great. There are many beautiful places and much delicious food here. I like Beijing very much.

    Peter and I are in the same grade, but we are in different classes. We live far from the school and it takes us a long time to go to school. We have to get up at 6:20 in the morning, and then at 6:30 we ride bikes to the bus stop. It takes us about 20 minutes. At about 7:00, we take the bus to school. We get to school at about 7:30.

    We have four classes in the morning and two in the afternoon. I think Chinese is too difficult, but Peter thinks it is easy. He can speak Chinese very well and he often helps me with it.

    How is everything going with you in the USA? Write to me soon.

Love,

Kate

当前，世界形势发生了很大变化：比如，政治格局多极化、世界经济全球化。结合所学知识，谈谈你对经济全球化的理解。

歌曲《走进新时代》唱道：“我们唱着东方红，当家作主站做起来，我们唱着春天里的故事，改革开放富起来……”。中国人民“当家做主站起来”开始于（   ）

《醉翁亭记》写景的主要作用是（　　）。

下图示意某河流的“V”型河谷形态，读图，完成下列各题。