题目

吞噬细胞对细菌抗原的吞噬、加工处理和呈递过程如下图所示。下列叙述正确的是( )   A．吞噬细胞特异性地吞噬细菌抗原 B．溶酶体参与抗原的加工处理过程 C．加工处理后的抗原可直接呈递给B淋巴细胞 D．抗原加工处理和呈递过程只存在于体液免疫 答案：B —Dad, when will you be free? You agreed to go to     the seaside with me fourdays ago.     —I'm sorry, Jean. But I think I will have a          holiday soon. [     ] A. four-daysB. four-dayC. four daysD. four day's