17世纪英国革命中克伦威尔建立护国政体，18世纪美国独立战争后将邦联制改造成联邦制，19世纪初拿破仑建立法兰西帝国。这一系列现象反映出（   ）

从方框中选择最佳选项完成对话，有两项多余。

A: Hi, Bill! You are reading the novel again.

B: Yes, Tom. I’ll never be tired of it.

A:____

B: Twice. Every time I read it, I can always learn something new.

A: Really?____

B: Charles Dickens. I think he’s a great English writer. What about you?

A:____ He is also my favorite foreign writer. Please let me have a look at it.

B: OK, here you are! What do you think of this novel?

A:____ I haven’t seen such a nice novel for long. Where did you buy it?

B: In the Rose Bookshop.

A: I don’t know where it is.  ____

B: No. Only ten minutes’ walk from here, next to the People’s Park.

A: Oh, I see. I’m going there to buy one, too. Thank you!

B: You are welcome.

已知：AB⊥BC于B，CD⊥BC于C，AB=4，CD=6，BC=14，点P在BD上移动，当以P，C，D为顶点的三角形与△ABP相似时，求PB的长？

读坎儿井图，完成下题．

如图，对称轴为直线x= $\frac{7}{2}$ 的抛物线经过点A（6，0）和B（0，4）．