【问】 However，he had at last been allowed to send a cable in which he informed the editor thathe had been arrested while counting the 1084 steps leading to the 15 foot wall which sur-rounded the president’s palace. (New Concept English，Book 3，P. 20)

请问句中的foot是否是five foot条中所说的零复数?

【答】 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 two hundred word reporta three-year old boy

a sixpenny stamp

但： The boy is three years old.

She is 5 foot tall.(这里的foot为零复数，参见five foot)

请做下面的英语试题：

1. The imposition nationwide of the fifty-five-miles an hour speed limit has reduced thenumber of accidents. (TOEFL，1984年美国考题)

2. Peanuts grow in long，bright green rows on 18-inches-high bushes. (TOEFL，1980. 8)

3. Lavender grows between three and four loots high. (TOEFL，82.11)