题目

科研人员为研究脾脏中某种淋巴细胞（简称M细胞）在免疫应答中的作用，进行了如下实验： 组别   处理方式                                                                                        检测结果 实验组                                                                                                      用肺癌细胞抗原处理X细胞后分离出X细胞— Excuse me, where is the bus stop? —________________.A．Go straight and turn right.B．That’s OK.C．It’s on the wall.D．No, the bus is very big.