患有（）的从业人员作为污染源传播病原体的能力不会显著增强。
A.呼吸道疾病
B.心血管疾病
C.消化道传染病
D.化脓性皮肤病
参考答案：B
She told me that it was _____ you spoke ill of her behind her back _____ she disliked you.
A．since; that
B．for; that
C．because; that
D．that; why
给中世纪脱离儿童实际生活的经院式教学以沉重打击的进步是提出了（）。
A.因材施教教学原则
B.启发性教学原则
C.直观性教学原则
D.巩固性教学原则
