B: it is. It's got pictures of interesting building from all over the world, with brief descriptions of how they were build, their purpose, and so on.
A: there are the pyramids. It's easy to see how they got that name! they don't have smooth sides though.
B: they don't now, but most of them did originally. There's picture of the pentagon in the united states. It's very distinctive with its five sides.
A; look at that cylindrical office building. I've never been seen one that shape before.
B; yes. Usually only towers are cylindrical in shape.
A: tv towers are usually thicker at the bottom than at the top. They're not perfectly cylindrical.
B: this is the world's largest sports stadium. It's a massive oval.
A; what sports do they play there?
B: it says here that it's mainly used for big football matches and athletics meetings.
A: is that building a perfect cube?
B: according to the book, it is. I've never seen a building that is a perfect cube. Look at the building. From the air, it looks like a square with a semi-circle attached to each of its four sides. What kind of building is it?
A: It says here that it's a war memorial. Now, there's a distinctive structure-the atomium in Brussels. See? It consists of several connected by cylinders. I believe you can go up and down inside it.
