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    Have you ever rubbed your hands together when they get cold? Why do we do that? We do that for friction. Friction happens when two things that aren’t very smooth rub together to make heat energy. The faster you rub two things together, the more friction ( and heat) you can make. Let’s discover friction!

    WHAT YOU’LL NEED

    ·Soap ·Water·Your hands!

    WHAT TO DO

    Make sure your hands are dirty.

    Rub your hands together until you feel the heat of your hands.

    Now, use soap and water to get your hands very slippery(滑的).

    Try to make friction happen while your hands are slippery.

    Please write down what has happened.

    LET’S TALK!

    Friction is an energy that happens when two things rub together. When friction happens, it makes heat! When your hands are slippery, they won’t make very much friction and your hands won’t get so hot.

    DID YOU KNOW?

    Friction happens when you stop your fast running bike.

    Ancient people made fire by rubbing two pieces of wood together. Friction happened though they didn’t know it.

    ____?___

    Friction is everywhere. Have you ever noticed situations where friction is happening? If not, ask your parents to take you out in a car. If it is not hot, touch the tires(轮胎) of the car before and after a short drive to see how much warmer they get from friction.

    1. This text is most probably________________________.

    A. a science report????????????? ????????????? ????????????? 　 B. a car advertisement

    C. a rubbing introduction?????? D. a chemistry programme

    2.What does the word “friction” in this text mean in Chinese????????

    A.摩擦????????????? ????????????? B. 冷却??????? C. 膨胀????????????? ????????????? ????? D.震动

    3.___________ is not an example of friction.

    A. Bike riding????????????? B. Car driving??? C. Hands rubbing????????????? ? D.Friction discovering

    4.What’s the last column(栏目)?

    A. THINK IT OVER!????????????? ????????????? ????????????? ????????????? ?? B. WHAT HAPPENED?

    C.EVERYDAY ACTION:????????????? D. WORK WITH PARENTS

     

    【答案】

    1.A

    2.A

    3.D???

    4.D

    【解析】

    试题分析：短文大意：本文主要介绍有关摩擦的一些知识。摩擦是无处不在的。只不过是你注意到了没有。

    1.细节理解题。通读短文可知此文是一片科学报告。所以选A。

    2.词义猜测题。根据常识，人们在天冷时，常常将两手摩擦而取暖，可推知加线词是摩擦的意思，所以选A。

    3.推理判断题。显然骑自行车、驾车、搓手都是摩擦的例子，但摩擦的发现并不是摩擦的例子，所以选D 。??

    4.段落大意题。根据If not, ask your parents to take you out in a ca可推知最后一个栏目是：和父母合作，所以选 D。

    考点：科普环保类阅读。

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