Passage Two
Seagulls(海鸥)don’t just steal food from tourists; they also make quite a mess on the boats of the Australian National Maritime Museum. Seagull droppings stain the boats, causing the museum staff to spend many hours cleaning up the mess left by the seagulls.
After many failed attempts at keeping the annoying seagulls away, the staff had a brilliant idea. Inspired by the method used at various airports to drive away wildlife, they sought out the Australian Dog Working Centre and adopted Bailey. The three-year-old dog was appointed the new position of Assistant Director of Seagulls and put to work.
The highlight of Bailey’s morning is chasing the seagulls away from the boats. For the first few weeks, Bailey was a little too enthusiastic about his new role and managed to jump into the water during the pursuit of seagulls. But it wasn’t long before he was fitted with a new work uniform—a bright yellow life vest that keeps him floating on water. Bailey even has a special staff ID with his photo and the title of his important position. He has had to get familiar with the museum’s waterfront, which he patrols(巡查)frequently. This is especially important at night when there is no human activity around to scare the seagulls off.
The museum staff members are all very fond of Bailey, making sure to give him lots of playtime, walks and affection. He is very well taken care of, with visits to the local animal doctor for grooming(梳毛)scheduled every two weeks.
When he isclocked on, Bailey prefers not to be disturbed so he can focus on his job. However, when he is not working, the museum encourages all visitors to come to say hello to their special employee. So the next time you visit the museum, make sure to say hello to this hardworking dog!
Which of the following is closest in meaning to "clocked on" in the last paragraph?