单项选择题
Solid green arrows on the main body of a pilot chart indicate （）.
A.prevailing wind directions
B.prevailing ocean current directions
C.probable surface current flow
D.shortest great circle routes
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On the south and the east coasts of Block Island are circles with a dot in the center and labeled CUP. This is a （）.
A.conspicuous object
B.steep depression in the surrounding hills that resembles a cup
C.domed structure useful for navigation
D.calling-up-point used for traffic control -
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Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．
A.published with
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A.with
B.from
C.on
D.by
