男性，23岁，乏力、食欲减退1个月，尿少、水肿及高血压1周，实验室检查发现贫血，血尿、蛋白尿，补体C3正常，血肌酐和尿素氮均升高，B超双肾增大，临床诊断为"急性肾衰竭"
急进性肾炎Ⅰ型进展至终末期肾衰竭后，可行肾移植的时机是（）
A.随时
B.维持性血液透析半年后
C.抗GBM抗体转阴后
D.抗OBM抗体转阴后半年
E.经血浆置换及激素、细胞毒药物治疗后
参考答案：D
No air means death．Though we see it，there is air around us. air is everywhere and it gives life to every living thing．Without it we can’t live．Bad air makes people ．We must have fresh(新鲜) to keep us in good health． In the city there are a lot of people and there are too many running on the road．The gas(气体) which the car sends out(排放) is made up of(组成) bad gases．Every day we breathe it in and ．This makes us sick． So people should door as much as they can．There are many factories，too．From the chimneys of these factories，we get the smoke usually in black color．This kind of smoke does harm our health．So in order to(为了) keep us ，we have to go out to the countryside to breathe more fresh air．Or we can go up hills to get more fresh air．
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