A:Not anxiou
B:Anxious not
C:Being not anxiou
D:Not being anxiou
This is Bill. He's my friend. He's fat.
—It's ____ (Amy) eraser.
待鉴别物质
鉴别方法
A
硬水、软水
加肥皂水,搅拌,观察产生泡沫的多少
B
氧气、空气
用带火星的木条检验,观察木条复燃情况
C
氮气、二氧化碳
用燃着的木条检验,观察木条是否熄灭
D
棉纤维、羊毛纤维
灼烧,闻燃烧产生的气味,观察燃烧情况和灰烬