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

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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。