The little boy came riding full speed down the motorway on his bicycle. it was!A. What a

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(答案→)A. What a dangerous scene
B. What dangerous a scene
C. How a dangerous scene
D. How dangerous the scene
解析：感叹句句型。英语中的感叹句分what和how开头两种：
1）What +a/an+形容词+单数可数名词+主语+谓语；What+形容词+不可数名词（复数名词）+主语+谓语 
2）How+形容词（副词）+主语+谓语；How+形容词+a/an+单数可数名词+主语+谓语
根据以上结构，四个选项只有A项正确。