Please pick up the . Don’t keep it on the floor.A. paperB. boxesC. booksD. bottles

问题补充：

Please pick up the . Don’t keep it on the floor.

A. paper

B. boxes

C. books

D. bottles

答案：

(答案→)A. paper

B. boxes

C. books

D. bottles

解析：名词的考察由“Don’t keep it on the floor.”可知应是不可数名词或单数可数名词