单项选择题

The iron mike is a(n) （）.

A.pilot
B.speaker
C.standby wheel
D.automatic pilot

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The first indications a mariner will have of the approach of a warm front will be （）.

A.large cumulonimbus (thunderclouds) building up
B.high cirrus clouds gradually changing to cirrostratus and then to altostratus
C.fog caused by the warm air passing over the cooler water
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The characteristic of a lighted cardinal mark may be （）.

A.very quick flashing
B.flashing
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Temperature and moisture characteristics are modified in a warm or cold air mass due to （）.

A.pressure changes in the air mass
B.movement of the air mass
C.the heterogeneous nature of the air mass
D.upper level atmospheric changes