In the Northern Hemisphere，gusty winds shifting clockwise，a rapid drop in temperature，thunderstorms or rain squalls in summer (frequent rain/snow squalls in winter) then a rise in pressure followed by clearing skies，indicate the passage of a(n) ______

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• 1As the temperature of an air mass decreases，the ______．

  A.absolute humidity（湿度） decreases

  B.relative humidity increases

  C.specific humidity decreases

  D.dew point rises

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• 2Plain language is usually used on marine weather ______．

  A.forecasts

  B.observations

  C.analyses

  D.reports

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• 3Vessels are warned ______ in the area enclosed by pecked lines owing to the existence of numerous telegraph cables．

  A.anchor

  B.to anchor

  C.not to anchor

  D.not to anchoring

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• 4I have steerage way．It is said that ______．

  A.I am underway

  B.I am out of control

  C.I am not making way through the water

  D.I have the amount of movement forward which the ship needs to be steered properly

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• 5In relation to the turning circle of a ship，the term advance means the distance ______．

  A.gained at right angles to the original course

  B.gained in the direction of the original course

  C.moved sidewise from the original course when the rudder is first put over

  D.around the circumference of the turning circle

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• 6A generally circular low pressure area is called a(n) ______．

  A.cyclone

  B.anticyclone

  C.cold front

  D.occluded front

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• 7LOW AT 34N 135E ESLY SLWLY INTST NC.This description is most likely to be under the heading of ______．

  A.GL WNG

  B.GEN SYN

  C.STM WNG

  D.T Y WNG

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• 8MAINLY GOOD BECOMING MODERATE．This forecast probably refers to ______ in a certain area．

  A.visibility

  B.winds

  C.sea

  D.fog

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• 9A shipper of cargo aboard your vessel offers a letter of indemnity for the cargo．This is done in order to obtain a(n) ______．

  A.clean Bill of Lading

  B.order Bill of Lading

  C.straight Bill of Lading

  D.through Bill of Lading

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• 10No navigational aids are shown and chart is not kept corrected for alterations in depths inside the pecked lines．For more detailed information，the larger scale charts must be ______．

  A.bought

  B.analyzed

  C.consulted

  D.published

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