题目

制作人体口腔上皮细胞临时装片，应先在载玻片上滴生理盐水．再放细胞。生理盐水的浓度 A．大于上皮细胞内液的浓度    B．小于上皮细胞内液的浓度 C．接近等于细胞内液的浓度    D．完全等于细胞内液的浓度 答案：CNo one in the department but Tom and I __________ that the director is going to resign． [　　] A．knows B．know C．have knownD．am to know