摘要: Step 4 Practice 第四步 练习 (教师用课文中的噪声污染来启发学生找出周围的噪声污染.) T: We have learnt noise is a kind of pollution. What causes noise pollution around us? (让学生分组讨论.教师给学生一些引导.让学生说出我们身边的噪声污染.) S1: The students in the next room are singing. S2: Some students are talking loudly in the classroom. S3: Someone is typing the keyboard strongly. S4: Some people answer the telephone call aloud. S5: - (教师在列出噪声污染的各种来源后.教导学生如何避免出现这些现象.从而培养学生的环境保护意识.) T: Everyone knows noise pollution is harmful to our ears. But how can we solve these problems? S6: Speak to each other in a low voice. S7: Try to find a proper place to answer the telephone. S8: Type the keyboard softly. S9: Find a proper place and proper time to enjoy music. S10: - Step 5 Project 第五步 综合探究活动 方案一:

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 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.

   1. Your teacher wil probably tel you the rules above _____ the first lab lesson.

    A. before     B. since    C. during    D. after

2. Before every experiment, you should _____.

    A. taste the chemicals first

    B. clean al the apparatus

    C. read al instructions carefuly

    D. report al the accidents to the teacher

  3. When you are not sure how to use al apparatus, _____.

    A. try them on your own

    B. read the rules carefuly

    C. ask your teacher for help

    d. put them back

 4. It is clear that you can _____.

    A.  bring food into the lab

    B. enter the lab anytime

    C. smel chemicals as you like

    D. learn science directly in the lab

    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

 

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