题目

下列有关免疫学中抗原抗体的相关叙述错误的是                            A．抗体只能由效应B细胞产生 B．抗体可作用于细胞外和细胞内的抗原 C．一种抗原只能与相应的抗体或效应T细胞发生特异性结合 D．抗原决定簇暴露是抗原被识别的前提 答案：BGreatly moved by what he did, ____. [     ]A. tears came to my eyesB. my heart was full of gratefulness C. my eyes were filled with tears D. I could hardly hold back my tears