BOD5是指水中有机污染物被厌氧微生物分解的五日生化需氧量（）
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丝状菌的大量出现意味着要发生活性污泥膨胀或进水水质变差（）
Nancy: May I see your driving license and vehicle registration card, please？Dick: ______.
A. Sorry, I forgot to bring my homework.
B. Sure. Here is my business card.
C. Good. Did I do anything wrong？
D. Yes. But I don't think I am a good student.
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