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單項(xiàng)選擇題

The iron mike is a(n) （）.

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

單項(xiàng)選擇題

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
D.low dark clouds accompanied by intermittent rain