单项选择题
A．message B．note C．paper D．money
A．save you from waiting at some tourist sights B．offer you free bus rides throughout London C．enable you to shop online with discounts D．guide you to London’s best restaurants
A．It puts waste materials directly into new use. B．It promotes completely natural foods. C．It buries waste materials in landfills. D．It makes organic plant fertilizer.