※ 引述《tucson (tucson)》之銘言：
: 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
: 請問題答案應該選多少?
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".
（在複數所有格之後，正常來說，我們不會用單數名詞來表示"一人一個"之意）
The teacher told the children to open their books.
所以如果用單數，變成全部的猩猩都只有一個媽媽（主詞為複數代稱全體），這不可能。
所以應該選複數。國中課文康軒第二冊第八課閱讀篇也有一個句子：
Our bodies need fruit and vegetables.
供您參考