2022年英语专四听力dictation练习(7)

2021-11-25 17:38:00来源:网络

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  Plastic

  We use plastic wrap to protect our foods. We put our garbagein plastic bags

  or plastic cans. We sit on plastic chairs, play withplastic toys, drink from

  plastic cups, and wash our hair withshampoo from plastic bottles!

  Plastic does not grow in nature. It is made by mixing certainthings

  together. We call it a produced or manufactured material.Plastic was first made

  in the 1860s from plants, such as wood and cotton. That plastic was soft

  andburned easily.

  The first modern plastics were made in the 1930s. Most clear plastic starts

  out as thick, black oil.That plastic coating inside a pan begins as natural

  gas.

  Over the years, hundreds of different plastics have been developed. Some

  are hard and strong.Some are soft and bendable. Some are clear. Some are

  many-colored. There is a plastic for almostevery need. Scientists continue to

  experiment with plastics. They hope to find even ways to usethem!

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