题目

阅读与回答问题。（共5分）The Sawyers live at 87 King Street. In the morning, Mr Sawyer goes to work and the children go to school. Their father takes them to school every day. Mrs Sawyer stays at home every day. She does the housework. She always eats her lunch at noon. In the afternoon, she usually sees her friends. They often drink tea together. In the evening, the children come home from school. They arrive home early. Mr Sawyer comes home from work. He arrives home late. At night, the children always do their homework, Then they go to bed. Mr Sawyer usually reads his newspaper,化学实验基本操作是否规范往往会影响实验的成败，下列实验基本操作正确 的是（ ）A.先预热，再给试管内的物质加热B.试管夹从试管底部往上套，夹在试管中部C.用胶头滴管吸取氢氧化钠溶液后，将滴管平放在桌面上，以免污染原溶液D.可用嘴品尝化学实验室里试剂的味道