阅读理解
It's six forty in the morning. The children are coming into the classroom.
A girl is opening the windows. Some are laughing and talking. Some are listening to them. Some are reading books. Some are doing their homework.
Miss Lin is standing behind the teacher's desk. She is writing on the blackboard. Sue and Anna are wearing their new dresses today. Ann is cleaning her desk. Mike is helping her. They all look happy.
What are Bill and Bob doing? Oh, dear! They are still playing basketball.
水槽、导气管、橡皮塞、橡皮管、100mL容量瓶、玻璃棒、药匙、火柴。从缺少仪器或用品的角度看，该学生不能进行的实验操作是：①制取氢气、②海盐中除去泥沙、③用氢气还原氧化铜、④用氯化钠晶体配制100mL0.1mol·L—1的氯化钠溶液
