单项选择题
You have anchored in the wrong position obstructing other traffic. You must（）.
A.pick up your anchor B.heave up your anchor C.keep radio be silent D.drag your anchor
单项选择题 You must（）in this area unless you have messages about the casualty.
单项选择题 You shall（）this letter so as to signify your acknowledgement of the responsibility.
单项选择题 You should not divide the fresh water（）three trips.
