30. What clothes is an environmentalist most likely to buy?
A Clothes made of cotton
B Clothes made of mushroom.
C Clothes ade of leather
D, Clothes made of Tencel
31. What can we learn from Dr Richard Blackbun's word?
A Clothes made of cotton will benefit the environment
B Don't buy new clothes unless you make full use of the existing ones
C. Second-hand clothes can be unhealthy for wearers
D. Sustainable textiles will solve the environmental problems