单项选择题
This is（）where we shall anchor.
A.the light-house B.the anchorage C.the pilot station D.the light-buoy
单项选择题 There is sufficient anchorage for（）at all time around the No.1 buoy and for smaller vessels around the No.4 buoy.
单项选择题 The shortest distance between any two points on earth defines a（）.
单项选择题 The positions and characteristics of lights and buoys shown within the port area are（）.
