※ 引述《tucson (tucson)》之铭言：
: Gorillas are verey powerful and intelligent animals. Baby gorillas stay close
: to their _______ untill they are three years old.
: By this time they can follower the group by themselves.
: (A) mother (B) mothers (C) the mother (D) the mothers
: 请问题答案应该选多少?
在Practical English Usage P441.4有提到：
4 distributive use: She told them to open their books, etc
After a plural possessive, we do not normally use a singular noun in the sense
of "one each".
（在复数所有格之后，正常来说，我们不会用单数名词来表示"一人一个"之意）
The teacher told the children to open their books.
所以如果用单数，变成全部的猩猩都只有一个妈妈（主词为复数代称全体），这不可能。
所以应该选复数。国中课文康轩第二册第八课阅读篇也有一个句子：
Our bodies need fruit and vegetables.
供您参考