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單項選擇題

A decrease in barometric pressure is associated with all of the following except（）.

A.rising warm air
B.proximity to a low pressure area
C.inward spiraling circulation
D.clear dry weather

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單項選擇題

（）during the voyage any case or suspected case of plague，cholera，yellow fever，smallpox，typhus or relapsing fever?

A.Has there been
B.Have there been
C.Has there
D.Have there

單項選擇題

（）day，pilot flag should be displayed from main mast.

A.From
B.By
C.on
D.With