补全对话

从方框中选择最佳选项完成对话, 有两项多余

a. I'm cleaning the house.

b. Is your mother making dumplings with her?

c. What about your father?

d. Yes, we are.

e. She is buying some food in the shop.

f. What's your mother doing?

g. They are making cards for their family and teachers.

Daming: Hi, Tony! Are you getting ready for Spring Festival?

Tony:____ 

Daming: What are the girls doing?

Tony:____

Daming:Sounds great(听起来很好)! Where is your mother?

Tony:____

Daming: What are you doing?

Tony:____

Daming: How hard you are working! And is your sister helping you?

Tony: No, she isn't. She is shopping with my mother.

Daming:____

Tony: Look! He's painting the door there.

左图为我国某河流河道示意图，甲为一河心沙洲，右图为该沙洲一年内面积变化统计图，读图结合所学知识，回答下题。

峡湾景观是斯堪的纳维亚半岛著名的旅游资源，其成因是（    ）