教室采光标准是（）。
A.朝向
B.室深系数
C.开角、入射角
D.玻地比
E.反射系数
参考答案：A, D, E
Mary is ill today. If she _____, she _____ absent from school. [ ]
A. were not ill; wouldn't be
B. had been ill; wouldn't have been
C. had been ill; should have been
D. hadn't been ill; could be
伤寒患者排菌量最多的时期是（）。
A.起病后第1周
B.起病后第2～4周
C.起病前1周
D.起病后第5周
E.起病后第6周
