急性白血病感染时，最常见的病原菌是（）

A.表皮葡萄球菌 

B.隐球菌 

C.带状疱疹 

D.肺炎克雷白杆菌 

E.卡氏肺孢子虫

Sometimes a dictionary designates a noun as attributive, which means that it can be used to describe another noun or name its attributes.()

A. conveys

B. defines

C. indicates

D. explains