— His jokes made him a silly person.
— I don't think so. He is a funny man.
A:clever
B:stupid
C:wise
标出下列物质中各元素的化合价.
氯化锌 ____ ,钠____ ,氢氧化钠 ____ .
实验室中有两瓶失去标签的稀盐酸和氯化钠溶液,下列四种试剂中能将其鉴别出来的是( )