阅读理解

　　Laboratory work is your chance to learn science firsthand．It can be fun but you must be careful to prevent injury．Listen closely when your teacher reads and explains the rules before your first lab lesson．

　　LABORATORYRULES

　　Throughout the lesson

　　·Do not enter the science lab without the teacher’s permission．·No food or drinks are to be alowed in the science lab．

　　Before the Experiment

　　·Read al instructions carefuly before every experiment．

　　·Prepare al apparatus(仪器)and arrange them so that you wil not knock them over while doing the experiment．

　　During the Experiment

　　·If you are unsure of how to use any apparatus or how to operate, ask your teacher for help．·Never smel or taste chemicals unless your teacher gives permission．

　　After the Experiment

　　·Wash al apparatus after use and return them to the places where they were．

　　·Throw waste materials in proper waste baskets．First Aid

　　·Report al accidents to your teacher immediately．

　　·If you spil(溅 出)any chemicals onto your body or clothing, wash with plenty of water and report to your teacher．