44. Having heard much about should see them in action. I the life-guards on my trip Australia, could hardly wait for the me when were strong had been told that they were a specially selected body of men all of whom swimmers. Australian beaches sometimes provide quite unexpected dangers as they are crowded in summer, the life-guards' duties are to save people from drowning bring in those who have been carried too far out by swift currents, and above all, to keep a sharp lookout for unwelcome visitors like sharks. "they refers to.........................
a. tourists
b. expected dangers
c. Australian beaches
d. life-guards