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(輪胎) 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. 冷卻??????? C. 膨脹????????????? ????????????? ????? D.震動(dòng)

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(欄目)?

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】

試題分析：短文大意：本文主要介紹有關(guān)摩擦的一些知識(shí)。摩擦是無處不在的。只不過是你注意到了沒有。

1.細(xì)節(jié)理解題。通讀短文可知此文是一片科學(xué)報(bào)告。所以選A。

2.詞義猜測(cè)題。根據(jù)常識(shí)，人們?cè)谔炖鋾r(shí)，常常將兩手摩擦而取暖，可推知加線詞是摩擦的意思，所以選A。

3.推理判斷題。顯然騎自行車、駕車、搓手都是摩擦的例子，但摩擦的發(fā)現(xiàn)并不是摩擦的例子，所以選D 。??

4.段落大意題。根據(jù)If not, ask your parents to take you out in a ca可推知最后一個(gè)欄目是：和父母合作，所以選 D。

考點(diǎn)：科普環(huán)保類閱讀。

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