《2025年新课程学习与测评单元双测九年级英语全一册人教版》

三、阅读理解。(每小题2分，共40分)
A
Lab work is fun but you must be careful. Listen carefully when your teacher reads and explains the rules before your first lab lesson.

根据材料内容，选择正确答案。
(A)16. You must know the lab rules ________ the first lab lesson.
A. before
B. since
C. during
(A)17. It is necessary for you to ________ before every experiment.
A. read all the instructions carefully
B. take enough food and drinks
C. smell chemicals immediately
(C)18. The underlined word “spill” means “________” in Chinese.
A. 照射
B. 伤害
C. 溅出
(C)19. When you are in the science lab, you mustn’t ________.
A. be careful in order to prevent injury
B. listen carefully when your teacher explains the rules
C. taste chemicals without the teacher’s permission
(B)20. If some accidents take place, you should ________.
A. keep silent
B. report to the teacher
C. try to solve them by yourself

答案： 16. A 17. A 18. C 19. C 20. B