The winning car reached a speed of forty milesan hour-- much faster than any of its rivals.
1.an hour前为何不加介词？
2.an hour是名词词组作状语吗？
3. a speed of forty miles是名望词组作状语修饰an hour吗？
4.much faster than any of its rivals.为何没主语和动词的？
The winning car reached a speed of forty milesan hour-- much faster than any of its rivals.
1.an hour前为何不加介词？
——forty milesan hour：每小时50英里。an hour = per hour = every hour，表示“每”的定义时，名词前用不定冠词，per，every，不加任何介词。
2.an hour是名词词组作状语吗？
—— 是的。
3. a speed of forty miles是名望词组作状语修饰an hour吗？
—— 否。a speed of forty milesan hour，应如此描述：of forty milesan hour 作定语，修饰a speed，而forty milesan hour 和speed 存在“同为关系”。
4.much faster than any of its rivals.为何没主语和动词的？
—— 主语是A speed，动词是is，均承前省略。完整表达为：
The winning car reached a speed of forty milesan hour. It ismuch faster than any of its rivals.
