【单选题】听力原文: (20) To most of us, sharks are the most dangerous fish in the sea and they attack humans. However, according to Doctor Clark, who has studied the behavior. of sharks for twelve years, humans are...
【单选题】The word 'bead' originally means 'prayer', but later it refers to 'the prayer bead', the visible manifestation of a prayer, finally 'small, ball-shaped piece of glass, metal or wood'. This is an examp...