單項(xiàng)選擇題

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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單項(xiàng)選擇題

Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．

A.published with
B.combined with
C.in connection with
D.subject to

單項(xiàng)選擇題

My position has been obtained （） astronomical observation．

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

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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 （）.

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Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．

My position has been obtained （） astronomical observation．

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Navigational charts are （） frequent changes，the important one of which are promulgated by Admiralty Notices to Mariners．