—Who can reach the book on the top of the shelf?

—Xiaoqiang can. He is the ________ boy in our class. [ ]

A. shortest

B. strongest

C. tallest

按DL/T448-2000规程规定，第Ⅰ类客户计量装置的有、无功电能表与测量用电压、电流互感器的准确等级分别应为（）

A.0.2S，2.0，0.2，0.2S

B.0.2，2.0，0.2，0.2

C.0.5S，2.0，0.2，0.5S

D.0.5，2.0，0.2，0.5。