A、Lego's plan to rent bricks out.B、Lego's plan to produce less complex sets.C、Lego's plan to invest in a new field.D、Lego's plan to develop sustainable materials.
（2）、
A、Dealing with lost bricks.B、Finding enough raw materials.C、Reducing carbon emissions.D、Employing suitable technicians.
（3）、
A、It's complex and unrealistic.B、It can appeal to more children.C、It's eco-friendly but challenging.D、It can promote non-plastic bricks.
