单项选择题

Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．

A.concealed
B.buried
C.existed
D.built

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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

单项选择题

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

单项选择题

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

A.by
B.with
C.on
D.in