— is the ruler? Is it black?—Yes it is.A. HowB. WhoC. WhatD. What color

问题补充：

— is the ruler? Is it black?

—Yes, it is.

A. How

B. Who

C. What

D. What color

答案：

A. How

B. Who

C. What

(答案→)D. What color

解析：考查情景交际。“那把直尺是什么颜色的？黑色吗？”“是的。”根据句意可知，问的是颜色，故用what color。故选D。