The red pencil is than the green one.A. shortB. shorterC. niceD. the shortest

问题补充：

The red pencil is than the green one.

A. short

B. shorter

C. nice

D. the shortest

答案：

A. short

(答案→)B. shorter

C. nice

D. the shortest

解析：

试题分析: 句意：经铅笔比绿铅笔短。short短，than比，形容词用比较级，故选B.