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  • 1. (2017·赤峰) 根据表格内容,选择最佳答案。

        Lab work is fun but you must be careful. Listen carefully when your teacher reads and explains the rules before your first lab lesson.

    LAB RULES

    Throughout the lessons

    * Do not enter the science lab without the teacher's permission(允许).

    * No food or drinks are to be allowed in the science lab.

    Before the Experiment

    * Read all instructions carefully before every experiment(实验).

    * Prepare all apparatus(仪器)and put them in right places 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 into proper waste baskets.

    First Aid

    * Report all accidents to your teacher immediately.

    * If you spill any chemicals onto your body or clothing, wash with plenty of water and report to your teacher.

    1. (1) You must know the LAB RULES ______ the first lab lessons.
      A . before B . since C . during D . after
    2. (2) It is necessary for you to ______ before every experiment.
      A . read all instructions carefully B . take enough food and drinks C . smell chemicals immediately D . talk with your classmates.
    3. (3) If you are not sure of how to use any apparatus, ______.
      A . read the rules carefully B . try them again and again C . ask your teacher for help D . return all apparatus to the places where they were
    4. (4) The underlined word “spill” means ______.
      A . 照射 B . 伤害 C . 摔下 D . 溅出
    5. (5) 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 D . throw waste materials into proper waste baskets

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