However, he had at last been allowed to send a cable in which he informed the editor that he had been arrested while counting the 1084 steps leading to the 15 foot wall which surrounded the president's palace. (New Concept English, Book 3, p. 20)
请问句中的foot是否是foot条中所说的零复数？
上句中的foot并非是零复数形式，而是单数形式，因为数词 名词结构用作定语时，其中的名词通常要使用单数。当数词 名词 形容词结构用作定语时，情况亦是如此。
a five-pound note a three-year-old boy
a two hundred word report a six penny stamp
但: The boy is three years old.
She is 5 foot tall. (这里的 foot 为零复数, 参见 foot)
请做下面的英语试题：
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The imposition nationwide of the fifty-five-miles an hour speed limit has reduced the number of accidents. (TOEFL)
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Peanuts grow in long, bright green rows on 18-inches-high bushes. (TOEFL)
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Lavender grows between three and four foots high. (TOEFL)