The cells of humans, especially of the brain, can live only minutes without circulating blood.
A. that
B. ones
C. it
D. those
网友回答
A. that
(答案→)B. ones
C. it
D. those
解析：考查代词，A. that那个；B. ones表示同类事物，复数形式；C .it指同一个事物；D. those表示那些，句子意思“人类细胞。尤其是脑细胞，没有血液循环只能活几分钟”