听力音频：

Write ONE WORD AND/OR A NUMBER for each answer.

Waste sorting:	Necessarycharacteristics of dustbins
Solid and 11. ……..	Three kind: – recyclable garbage (blue or green bin) – unrecoverable garbage (yellow bin) – toxic waste (red bin)
waste collection:	Commercial waste collection: – It mainly refers to 12. …….. Waste. – Warning Signs state not to 13. …….. blue/green bin. – Those 14. …….. metals will cause environmental pollution. Household waste collection: – All kitchen garbage should be put into a 15. …….. Bag. – Garbage disposal plant is situated in an 16. …….. space or field. – The waste is disposed of at least once every 17. …….. – The dustbin should be cleared at nights because of 18. …….. – The waste is mainly produced by 19. …….. industry, retail and offices. – Please do not dispose of 20. …….. in any of the bins.