单项选择题
Admiralty Sailing Directions are Kept up to date by （）.
A.corrections
B.publications
C.supplements
D.alterations
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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.
A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal -
单项选择题
Sailing directions are kept up to date by （）.
A.publications
B.notices to mariners
C.supplements
D.Annual Summary of Admiralty Notices to Mariners
