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D. SIIK
C. stockings.
D. threads.
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6) What is NOT mentioned in the text?
A. Celluloid and Bakelite react to heat in different ways.
B. John Wesley was a famous chemist.
C. The chemical structure of plastic is the same as that of rubber.
D. The mix of different kinds of plastic in a product makes recycling it difficult.
7) What was the first man-made fiber invented in the 1930s?
A. Silk
B. Nylon
C. Cotton
Next Question
D. Wool
Next Reading
8) Who was the inventor of nylon?
A. Thomas Edison
B. Wallace Carothers
C. Benjamin Franklin
D. Alexander Graham Bell
9) Which of the following materials can be used to make plastics biodegradable?
A. Wood
B. Metal
C. Starch D. Glass
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