People in China used to keep records by putting a number of stones together, ___?

A．usedn’t they to

B．did they

C．used to they

D．didn’t they

哪种疾病可致肾影缩小()

A．重复肾

B．肾脓肿

C．肾积水

D．肾缺血

E．肾肿瘤