Before you read the passage, talk about these questions. 1. What are some materials that plumbers work with? 2. Which materials are strongest? Which are the most flexible?

This question asks for a preliminary discussion. Based on the images and the text in the catalog, plumbers work with materials such as stainless steel, porcelain, rubber, copper, chrome, and plastic. It is hard to say which materials are strongest without more information. Stainless steel and copper are likely candidates. Rubber and plastic are likely the most flexible.