Laboratory work is your chance to learn science first-hand. It can be fun but you must be

Laboratory work is your chance to learn science first-hand. 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 all apparatus (仪器) and arrange them so that you will 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 smell or taste chemicals unless your teacher gives permission.
After the Experiment
Wash all apparatus after use and return them to the places where they were.
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 of 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．beforeB．sinceC．duringD．after【小题2】Before every experiment, you should     .A．taste the chemicals firstB．clean all the apparatusC．read all instructions carefullyD．report all the accidents to the teacher【小题3】When you are not sure how to use all apparatus,     .A．try them on your ownB．put them backC．ask your teacher for helpD．read the rules carefully【小题4】It is clear that you can     .A．bring food into the labB．enter the lab anytimeC．smell chemicals as you likeD．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 ExperimentB．First AidC．During the ExperimentD．After the ExperimentA