②干冷的烧杯内壁出现____现象,澄清的石灰水____.
结论:蜡烛燃烧生成水和二氧化碳.其文字表达式为____.
Do you have a room? I have a room. It is very beautiful. I clean it everyday. This is my room. It is not very big. There is a picture on the wall. There are some books on the desk. The dog is on the floor, and it is sleeping. Where is my sister? Oh, she is under the desk.
根据课文将正确的答案写在横线上。
与左心房相连的血管是( )