1 Introduce the activity. Q1: How to make a suggestion? 2. Alone or in pairs, learners match the remaining functions to the actual words. 3. Check their answers and then elicit alternatives for each function
Guangdong Instltute of Textile Technolegy Introduction Fibers in which forming substance is cellulose acetate where not less than 92% of hydroxyl groups are acetylated: replacing -OH groups with -COCH3. Acetate: 2 of 3 -0H groups in each 6- member ring are acetylated; ~2.5 Triacetate: Nearly all -OH groups are replaced 2.91~2.96