单项选择题

Attention is called to the fact that in many cases charted depths may be decreased by up to （）.

A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom

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At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.

A.a vessel arrives at a port in a evening
B.a vessel leaves a port in a evening
C.a vessel arrives at a port in a morning
D.a vessel leaves a port in a morning

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As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.

A.by
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Areas enclosed by a long and short dashed magenta line indicate （）.

A.cable areas
B.dumping grounds
C.fish trap areas
D.precautionary areas