—People near the lake didn't allow them to________ a factory so as not to pollute the water.
A：look up
B：put up
C：take up
D：set up
x
…
－2
0
2
3
y
8
当x＝－1时，y＝____．
选项
物质
鉴别方法
A
氧化铜粉末和铁粉
用磁铁吸引
B
氢氧化钠和硝酸铵
加水后测温度变化
C
氯化铵和硫酸铵
加入熟石灰粉末研磨
D
羊毛纤维和合成纤维
点燃后闻气味
