如图（a）所示，在质量、高度均相等的甲、乙两圆柱体上沿水平方向切去相同的厚度，并将切去部分叠放至对方剩余部分上表面的中央，如图（b）所示。若此时甲′、乙′对地面的压力、压强分别为F_甲′、F_乙′、p_甲′、p_乙′，则（     ）

一个梯形的上底4米，下底3米，高6米，面积是____平方米。

到三角形三条边的距离相等的点是三角形（　　）的交点．

某课题的中心词是“杜鲁门主义”“欧洲一体化”“日本崛起”“中国振兴”“苏联解体”。由此推断，该课题的中心内容最有可能是（  ）    

Ann: What are you going to do this afternoon?

Ken: I'm going to buy some DVDs about Quanzhou Maritine Silk Road.

Ann: ____ Why not go to the Film Fans' Room?

Ken: The Film Fans' Room? ____

Ann: It is a place where students can exchange their DVDs with others. I think you can get what you want there.

Ken: ____ How can I get there?

Ann: It's next to Donghu Cinema. You can take the No. 13 bus.

Ken: OK. ____

Ann: There is one just outside Huaqiao University. You can get on the bus there.

Ken: Thank you very much.

Ann: ____