儿童肾肿瘤主要是()
A.肾细胞癌
B.肾胚胎瘤
C.肾盂癌
D.成人肾脏多形性腺癌
E.前列腺癌
参考答案:B
It rained heavily this morning, but _____ of my classmate were late for school. [ ]
A. neither
B. none
C. all
以下所列,须办理特殊物品检疫审批手续的有:
A.土壤
B.人体组织
C.转基因产品
D.生物制品