[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"exercise-C2-2749":3},{"preview":4,"open":12,"missing":30},{"id":5,"number":6,"total":7,"level":8,"course":9,"activity":10,"discriminator":11,"title":12,"slug":12,"instructions":13,"excerpt":14,"prompts":15,"lock":18,"access":19,"updated":20,"previous_id":21,"next_id":22,"previous":23,"next":25,"first":27},2749,57,80,"C2","speaking","images_discussion","speaking_images_discussion",null,"Look at the photographs and talk about them with your partner.","Four photographs showing how construction materials are produced or recovered.",[16,17],"First, I'd like you to look at pictures A and D and talk together about the environmental effects of these operations and how far those effects might be reduced. You have about 1 minute for this, so…","Thank you. Now look at all the pictures. I'd like you to imagine that a major housing programme wants to adopt a more sustainable materials policy. Talk together about availability, durability…","login","pro","2026-10-02T14:14:49",2748,2750,{"id":21,"number":24,"title":12,"slug":12},56,{"id":22,"number":26,"title":12,"slug":12},58,{"id":28,"number":29,"title":12,"slug":12},2693,1,false]