Scientists have created the world’s smallest snowman about a fifth of the width of a huma

问题补充：

Scientists have created the world’s smallest snowman, about a fifth of the width of a human hair．

A. measures

B. measuring

C. measured

D. to measure

答案：

A. measures

(答案→)B. measuring

C. measured

D. to measure

解析：考查现在分词作定语。measure 意为量起来为，没有被动语态，科学家们已经创造出了世界上最小的雪人，量起来为一个人的头发宽度的五分之一。measuring在句中作定语，相当于定语从句which measures，故选B。