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.

LABORATORY RULES Throughout the Lesson Do not enter the science lab without the teacher's permission. No food or drinks are to be allowed in the science lab. Before the Experiment Read all instructions carefully before every experiment. Prepare the apparatus(仪器) and arrange it so that you will not knock it 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 smell or taste chemicals unless your teacher gives permission. After the Experiment Wash the apparatus after use and return it to the places where it was. Throw waste materials in proper waste baskets. First Aid Report all accidents to your teacher immediately. If you spill(溅出) any chemicals onto your body or clothing, wash with plenty of water and report to your teacher.

 

 
【小题1】Your teacher will probably tell you the rules above  the first lab lesson.

A．before

B．since

C．during

D．after

【小题2】Before every experiment, you should .

A．taste the chemicals first	B．clean the apparatus
C．read all instructions carefully	D．report all the accidents to the teacher

【小题3】When you are not sure how to use the apparatus, .

A．try them on your own	B．read the rules carefully
C．ask your teacher for help	D．put it back

【小题4】It is clear that you can .

A．bring food into the lab	B．enter the lab anytime
C．smell chemicals as you like	D．learn science directly in the lab

【小题5】If you get chemicals on the clothing, you can find ways to solve it in the part .

A．Before the Experiment	B．First Aid
C．During the Experiment	D．After the Experiment