Look out! Don't get too close to the house____ roof is under repair.[ ]

A. whose          

B. which          

C. of which        

D. that

鉴别再生障碍性贫血和急性白血病的实验室检查主要是()

A．白细胞计数

B．骨髓象

C．网织红细胞绝对值

D．肝、脾淋巴结有否肿大

E．血涂片找幼稚细胞