1. From her _____ , I guess she must come from the West of America.
A. sound B. voice C. accent D. noise
【解析】选C。accent“口音”。句意：从她的口音，我猜她一定来自美国西部。sound“声音”；voice“嗓音”; noise“噪音”，与句意不符。
2. When the thief found the police had already ______ him, he ran away quickly.
A. realized B. known
C. recognized D. heard
【解析】选C。recognize“认出”。句意：当那个贼发现警察认出了他时，他很快逃跑了。
