问题 单项选择题 A1型题

下列哪一项属于初次应答的特点()

A.抗体产生量大,维持时间长

B.主要以IgG为主

C.产生的抗体与抗原的亲和力低

D.产生抗体与抗原的亲和力高

E.抗体产生潜伏期短

答案

参考答案:C

写句子

按要求写句子。    

1.睁着眼睛的蝴蝶被这个盲女孩神奇的灵性抓住了。(改为“把”字句)  

                                                                                                                                         

2.盲女孩深深地感动了我。   

     (1)改成“被”字句:                                                                                                     

     (2)改成反问句:                                                                                                            

3.我的女儿温迪自幼非常酷爱画马。(修改病句)

                                                                                                                                          

4.用关联词把两句话连成一句话。   

    (1)你不努力学习。    你考不了好成绩。

                                                                                                                                           

    (2)老师家离学校最远。    每天老师总是最早到校。

                                                                                                                                          

单项选择题