BIρ03BOD标准试验的温度为20℃，时间为（）天，称5日生化需氧量（BOD5）
A.5
B.10
C.15
D.20
参考答案：A
Was the weather nice?______,It was cold and windy every day.[ ]
A. Yes. it is
B. No, it isn't
C. Yes, it was
D. No, it wasn 't
