3. Do the quiz in pairs. Then check your answers with your teacher.

1. During World War IT (1939-1945), scientists used dandelions (see photo) to make

     a. cardboard.   b. paper   c. plastic   d. rubber  

2. The first bicycles had wheels made of

     a. wood with iron tyres  b. iron with rubber tyres  c. iron with wooden tyres 

3. Which one of these materials did the Ancient Romans not have?

     a. ceramic  b. concrete  c. glass  d. paper 

4. Are these sentences true or false?

     a. All types of wood float in water.

     b. No type of stone floats in water. 

5. The earliest use of nylon was in

     a. women's clothing.     b toothbrushes.     c parachutes.     d. guitar strings. 

6. Which of these metals is the hardest? Which is the heaviest?

     a. aluminium   b. copper    c. gold    d. iron    e. steel