单项选择题
-（） -I’m the agent.
A. What are you? B. Where are you from? C. Who are you? D. What are you doing?
单项选择题 （）? -I am your agent. I want to see the captain.
单项选择题 The gangway is too high. Can you lower it （）?
单项选择题 As a duty sailor, you （）maintain a safety patrol.
