单项选择题
Every new supplement to the Sailing Directions （） the previous one．
A.enforces B.cancels C.corrects D.replenishes
单项选择题 In Admiralty Sailing Directions，STRIPES is the word used to indicate （）marking.
单项选择题 Sailing directions are kept up to date by （）.
单项选择题 Place names used on board ships should be those （）.
