【題目】 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:

①Make sure your hands are dirty.

②Rub your hands together until you feel the heat of your hands.

③Now, use soap and water to get your hands very slippery(滑的).

④Try to make friction happen while your hands are slippery.

⑤Please write down what has happened.

LET'S TALK!

Friction is an energy that happens when two things tub 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 fires 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 reportB.a car advertisement

C.a rubbing introductionD.a chemistry programme

【2】You'd better make your hands to get heat when you rub them.

A.slipperyB.dryC.wetD.smooth

【3】What does the word "friction" in this text mean in Chinese?

A.摩擦B.冷卻C.膨脹D.震動

【4】 is not an example of friction.

A.Bike ridingB.Car driving

C.Hands rubbingD.Friction discovering

【5】What's the last column(欄目)?

A.THINK IT OVER!B.WHAT HAPPENED?

C.EVERYDAY ACTIOND.WORK WITH PARENTS

【答案】

【1】A

【2】B

【3】A

【4】D

【5】D

【解析】

本文主要介紹有關(guān)摩擦的一些知識。摩擦是無處不在的。只不過看你是否注意到了它。

【1】推理判斷題。根據(jù)“Let's discover friction!”可知，我們要探索摩擦，因此本文可能是一篇科學報道，故選A。

【2】細節(jié)理解題。根據(jù)“①Make sure your hands are dirty.②Rub your hands together until you feel the heat of your hands.”可知，在摩擦雙手之前，先把手弄干，故選B。

【3】詞義猜測題。根據(jù)“Friction happens when two things that aren't very smooth rub together to make heat energy.”可知，當兩個不太光滑的物體摩擦產(chǎn)生熱能，因此這是表示摩擦。故選A。

【4】推理判斷題。根據(jù)“When your hands are slippery, they won't make very much friction and your hands won't get so hot.”可知，摩擦手會產(chǎn)生摩擦力；根據(jù)“Friction happens when you stop your fast running bike.”可知，騎自行車會產(chǎn)生摩擦力；根據(jù)“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.”可知，開汽車會產(chǎn)生摩擦力。因此摩擦的發(fā)現(xiàn)是不會產(chǎn)生摩擦力的。故選D。

【5】推理判斷題。根據(jù)“If not, ask your parents to take you out in a car”, 可推知最后一個欄目是：和父母合作，故選D。

認真閱讀題干，根據(jù)題干要求，在文中尋找答案所在的語句或段落，進行分析理解，詞義猜測，推理判斷和概括歸納，選擇正確的答案。例如小題2，根據(jù)“①Make sure your hands are dirty.②Rub your hands together until you feel the heat of your hands.”可知，在摩擦雙手之前，先把手弄干，故選B。

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