He suddenly appeared on ________ rainy night, which was ________ great surprise to us. [ ]

A. a; /  

B. a; a  

C. the; a  

D. /; the

微核试验可用于检测

A．DNA加合物

B．引起核粉碎的遗传毒物

C．断裂剂和非整倍体剂

D．引起碱基置换的遗传毒物

E．引起移码突变的遗传毒物