Mary: What are you going to do this weekend, Lucy?

Lucy:____much. How about you, Mary?

Mary: I'm going to buy my father a present for his fortieth birthday. Would you like to go with me?

Lucy: I'd love to, but where would you like to go shopping?

Mary:____place where they have many different stores.

Lucy: I hear a new shopping center just opened downtown.

Mary: That____great. What time would be good for you?

Lucy: How____2:30?

Mary: Sure. That would be fine.

Lucy: Where should we meet, then?

Mary :____meet just outside the shopping mall.

Lucy: OK. See you then.

Mary: See you.

数列$\left\{a_n\right\}$的通项公式为$a_n=2n-49$，当该数列的前n项和$S_n$达到最小时，n等于(   )

金华是国家级旅游城市，有许多著名景点，以下关于景区内生物的描述属于种群的是（　　）

地壳最薄的地方一般位于（　　）