题干
----Why are the housing prices in big cities going up all the time?
----One reason is that people are__________ into overcrowded cities in great numbers.
A：breaking
B：filling
C：pouring
D：hurrying
答案(点此获取答案解析）
C
、OH－ 3种阴离子，如果只取一次该溶液就能够分别将3种阴离子依次检验出来，下列实验操作顺序中，正确的是( )