Câu hỏi:

Read the passage and choose the best answer.

You can recycle many types of glass. Glass food and beverage containers can be reused and recycled many times. (In fact, only bulbs, ceramic glass, dishes and window glass can’t be recycled.)

Glass is made from soda ash, sand and lime. If it’s thrown away, it stays there indefinitely because glass never breaks down into its original ingredients. To be recycled, glass is sorted by color, crushed into small pieces and melted down into a liquid. Then, it is molded into new glass containers.

When people recycle glass, they ………………..