问题 单项选择题

钩端螺旋体通过破损皮肤进入人体并在体内大量繁殖,引起畏寒、发热、头痛、全身乏力等中毒症状,这是因为钩端螺旋体在体内肿块增大很快

A.分泌热休克蛋白

B.分泌细胞毒素

C.裂解并释放内毒素样物质

D.分泌神经毒素

E.分泌溶血素

答案

参考答案:C

解析:钩端螺旋体通过破损皮肤进入人体并在体内大量繁殖,分泌细胞毒素引起畏寒、发热、头痛、全身乏力等中毒症状。

识图题

                         图一                                   图二                                           图三

观察图片,请回答:

(1)图一反映的是什么历史事件?周恩来提出了什么方针推动会议取得了圆满成功?

                                                                                                                                                            

(2)图二反映的事件是在哪一年?中国是如何重返联合国的?

                                                                                                                                                            

                                                                                                                                                            

                                                                                                                                                            

(3)图三中访华的外国领导人是谁?他访华前“已经打开了两国人民友好往来的大门”的事件是什么?

    后来,这个国家与中国签署了什么文件?

                                                                                                                                                            

(4)结合以上材料及所学知识,你有何认识?

                                                                                                                                                            

单项选择题