• 1. (2021八上·南山期末) / ðə, ɪntrə'dʌkʃn ɪk'spleɪnz hau ðə mə'ʃi:n ɪz ju:zd /

  A . The instruction explains how the medicine is used. B . The instructions explain how the machine is used. C . The introduction explains how the machine is used.