制备单克隆抗体常选用小鼠的哪类细胞作为饲养细胞（）
A.中性粒细胞
B.NK细胞
C.肥大细胞
D.成纤维细胞
E.腹腔细胞
参考答案：E
所有鸟类都具有的繁殖行为是( )
A．求偶、交配、产卵
B．筑巢、交配、产卵
C．求偶、产卵、孵卵
D．产卵、孵卵、育雏
The policemen the stolen place again and again,and finally they found the evidence who stole the
antique. [ ]
A. got through
B. picked up
C. went over
D. turned over
