男性，12岁。上呼吸道感染后10余天，出现肉眼血尿、颜面水肿，血压130/90mmHg，血肌酐150μmol/L，血清补体C3下降。最可能的诊断是（）

A.急性肾炎（链球菌感染后肾炎）

B.急进性肾炎

C.慢性肾炎急性发作型

D.IgA肾病

E.遗传性肾炎

按要求改写下列句子。

1. Have you looked in the classroom? (做肯定回答)

    ______, I ______.

2. Jenny is at the computer. (就划线部分提问)

    ______ ______ Jenny?

3. It's a quarter after three. (改为同义句)

    It's a ______ ______ ______.

4. His father has been to America. (就划线部分提问)

    ______ ______ his father ______?

5. She has finished her homework. (改为一般疑问句)

    ______ she ______ her homework?