任务型阅读根据短文内容，从短文后的五个选项中选出最佳选项填入文中相应的位置。下面文章中有5处（第71—75题）需要添加小标题。请从以下选项中选出符合各段意思的小标题。Have yo

任务型阅读
根据短文内容，从短文后的五个选项中选出最佳选项填入文中相应的位置。
下面文章中有5处（第71—75题）需要添加小标题。请从以下选项中选出符合各段意思的小标题。

Have you ever rubbed(擦) your hands together when they get cold? Why do we do that? We do that for friction(摩擦). 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!
● _【小题1】 _
Soap Water Your hands
● _【小题2】_
(1). Make sure your hands are dry.
(2). Rub your hands together until you feel the heat of your hands.
(3). Now, use soap and water to get your hands very slippery(滑的).
(4). Try to make friction happen while your hands are slippery.
(5). Please write down what has happened.
● _【小题3】
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.
● _【小题4】
(1). Friction happens when you stop your fast running bike.
(2). Ancient people made fire by rubbing two pieces of wood together. Friction happened though they didn’t know it.
● _【小题5】
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 too hot, touch the tires(轮胎) of the car before and after a short drive to see how much warmer they get from friction.C

(答案→)C 解析：这篇文章通过实验给我们讲述了摩擦力的产生的条件和过程，在生活中，处处都存在摩擦力。【小题1】根据下文提供的道具：肥皂，水，手。可知，前文是What you’ll need你需要什么？故填C【小题2】根据下文提供的做实验的步骤，可知，这里是填需要做什么？故选E【小题3】根据下文讲述的摩擦力的产生过程。故这里填B【小题4】下文提供了两个你可能不知道的事例，可知，这里是填D【小题5】下文讲述了在我们的生活中也有很多摩擦力产生，和你的父母一起观察吧。故选A

谢谢解答