—Oh, I _________ notice it. Thanks for telling me.
A：says; don't
B：writes; don't
C：says; didn't
D：writes; didn't
北魏孝文帝改革为中华文化的传承和延续注入了新的活力。下列评述正确的是（ ）
阅读理解
This is my new bedroom. There is a small shelf on the desk. Two end tables are near the bed and a photo is over the bed. The chair is in front of the desk. Look at my shoes. They are under the bed. I clean my bedroom on Sunday. I empty the trash every day. Mom says I'm a helpful boy.
选项
物质
杂质
除杂试剂或操作方法
A
氯化镁溶液
氯化钠
加入适量硝酸银溶液，再过滤
B
硝酸钠溶液
硫酸钠
加入适量氯化钡溶液，再过滤
C
熟石灰
石灰石
高温煅烧
D
一氧化碳
二氧化碳
通过氢氧化钠溶液，再用浓硫酸干燥
