以下适合湿热灭菌的物质是（）
A.空气
B.发酵设备和管道
C.玻璃器皿
D.培养基
参考答案：B, D
Look! Lucy’s cake is __________ of all.[ ]
A. very big
B. so bigger
C. biggest
D. the biggest
--- Why is Jenny still standing there? It’s so cold.
—She _____ for someone.
A．can wait
B．might have waited
C．must be waiting
D．should have waited
--- Why is Jenny still standing there? It’s so cold.