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

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• 1In 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) ______

  A.warm front

  B.tropical cyclone

  C.anticyclone

  D.cold front

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• 2As 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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• 3Plain language is usually used on marine weather ______．

  A.forecasts

  B.observations

  C.analyses

  D.reports

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• 4Vessels 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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• 5I 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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• 6LOW 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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• 7MAINLY GOOD BECOMING MODERATE．This forecast probably refers to ______ in a certain area．

  A.visibility

  B.winds

  C.sea

  D.fog

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• 8A 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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• 9No 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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• 10In revised editions of Admiralty charts the ______ are corrected first．

  A.smaller scales

  B.larger scales

  C.smaller scales and larger scales

  D.moderate scales

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