SPF动物：
参考答案：指不尊在某些特定的具有病原性或潜在病原性微生物的动物
道德的评价标准是（）
A.利益标准
B.政治原则标准
C.法律条文标准
D.善恶标准
E.生命质量标准
A great number of people were killed in the big fire, and the number of the people who _____ missing _______still increasing.
A．were; was
B．are; is
C．were; is
D．are; was
