问题 单项选择题 A1/A2型题

自身免疫性胃炎引起恶性贫血的原因是()

A.红细胞遭到破环

B.药物不良反应

C.缺乏叶酸

D.影响铁的吸收

E.维生素B12吸收不良

答案

参考答案:E

解析:自身免疫性胃炎产生壁细胞抗体和内因子抗体,导致胃体黏膜萎缩,壁细胞损伤,胃酸分泌减少,内因子减少,从而使维生素B12吸收不良,维生素B12可以协助叶酸调节红细胞生成,并有利于铁的吸收,因此引起恶性贫血。

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最近,洛阳小伙扶摔倒老人被讹一事引起了社会的广泛关注,人们都在议论还该不该去做好事,帮助他人。而“Positive Energy”一词早已对我们中国人产生了很大影响,因此,很多人并不会因此就不去做好事了。瞧!你身边就有很多助人为乐的同学,他们的事例值得我们学习。请根据下面表格信息给学校校刊写一篇短文,谈谈身边的好人好事,号召大家向他们学习。词数60—80(开头和结尾已给出,不计入总词数)
Who they are
        What they usually do to help others
 Liu Chang
       make our school beautiful (clean the classroom..) 
Li Bing
      help other students with their studies…
Zhang Ling
      help the people in trouble (cheer others up…)
     …
                  …
Dear Editor,
In our school,some students are always thinking more of others and ready to help them.I am moved deeply.Here is what they usually do.
Liu Chang is a very good student.                                                             
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                                            
                                                                   
I hope everyone can learn from them and do something for others.
Yours, 
Mark