下图代表人体体液免疫的过程。相关叙述正确的是
A:细胞I和细胞Ⅲ均能识别抗原
B:在①和⑨所在的阶段中,可能有巨噬细胞的参与
C:免疫过程⑥比⑦要慢,免疫效应⑥比⑦要强
D:图中免疫活性物质是抗体、淋巴因子、溶菌酶
The shop owner suddenly stopped talking with his mouth ________ like a big “O”. It was the President Xi Jinping.