在食品袋内放入的干燥剂是[ ]
A.无水硫酸铜
B.生石灰
C.固体氢氧化钠
D.食盐
答案:B
The sudents were silent as they saw the ___ look on their teacher’s face.
A.fright
B.frightening
C.frightened
D.both B and C
社会组织的分类原则包括( )。
A.协调原则
B.结构原则
C.目标原则
D.控制原则
E.功能原则