填空题

The word "plastic" comes from the Greek word "plastikos" and is used to describe something which can be easily shaped. You will see what a (36) name this is for "plastics". No other (37) in the history of the world has been used for so many different (38) . But what special qualities do plastics have The (39) of plastics is one of their most (40) qualities. Think how easy it is to lift plastic (41) ! Think, too, how light plastic containers are! A (42) man can carry many more plastic containers than containers made of wood or (43) or glass. It is quite extraordinary how many different kinds and qualities of plastics there are. (44) They can be made so strong that they will last almost for ever, or so thin and cheap (45) They can be made as clear as glass or completely black. (46) .They can even be made to look like wood or leather or rubber or stone.