阅读题: A company in San Francisco , California , has found a way to turn used plastic bottles into women's shoes . Every day , millions of Americans drink water and other liquids from plastic bottles . More than 60 million of them are thrown away each day . Many of the plastic bottles end up in landfills or are burned with other waste products . A San Francisco start - up company called Rothy's , however , turns this plastic waste into environmentally friendly shoes . Roth Martin is the company's co - founder . He explains how they turn plastic into soft material for women's feet . They take the plastic , clean it , and break it down into small pieces . Then they press them through a device that makes soft fibers . Those fibers are then combined together . This is done by a 3D machine . It is designed to reduce waste while making the shoes . The knitted stuff and the inner part of the shoe are then attached to the shoe's outer part , called the sole (鞋底). This outer sole is also made from environmentally friendly material : responsibly sourced no - carbon rubber . Rothy's shoes are sold online . They are flat shoes , with either a rounded or pointed toe . They come in different colors and designs . They cost either $ 125 or $ 145 per pair , depending on the design . After American actress Gwyneth Paltrow discovered them last year , the demand for the shoes grew . Martin says there is no shortage of material to fill that demand . "We're not going to run out of water bottles any time soon . So we have a limitless supply of material , and I think that is a good sign for our future . "When the environmentally friendly shoes wear out , customers can return them at no cost to a company that uses the recycled materials to make other products . For now , the shoes are only available to be shipped in the United States . However , the company says it will add international shipping in the near future . 1. How are used plastic bottles usually dealt with ? A . They are buried or burned . B . They are used to make shoes . C . They are changed into soft materials . D . They are returned to factories for reuse . 2. What does the underlined word"knitted"in the third paragraph mean ? A . Attached B . Fixed C . Combined D . Repaired . 3. Which of the following directly helped to increase the sales of Rothy's shoes ? A . The design and color . B . The reasonable price . C . The company's advertisement . D . The star power of Gwyneth Paltrow . 4. What is the purpose of the text ? A . To advertise a new kind of shoes . B . To describe the process of making shoes . C . To introduce a new way of recycling plastic waste . D . To stress the importance of environmental protection .