单项选择题
Admiralty Sailing Directions are Kept up to date by （）.
A.corrections B.publications C.supplements D.alterations
单项选择题 Every new supplement to the Sailing Directions （） the previous one．
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 （）.
