题干

浸没在液体中的物体受到的浮力,实质上是由于液体对其上、下表面的压力不同造成的.在液体中,深度越深,液体压强越大,物体受到的压力也越大.浸没在液体中的物体所受到的浮力大小与浸没在液体中的深度是否有关呢?为探究这个问题,实验室准备了弹簧测力计、天平、石块、木块、细线、烧杯、水.请你根据需要选择器材,完成以下题目.
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    When I was eleven years old, God gave me a gift of happiness and I had a carefree childhood in France.

    One day, on my way home from school, a truck ran over me and my legs were cut off. As I lay there bleeding, I suddenly realized that I might have to live the rest of my life without legs. How depressed I was at that moment! But then I realized that depression wouldn't get my legs back. So I decided not to waste my life feeling depressed. When my parents arrived at the hospital, they stood there quietly, looked so shocked and sad. I told them, “I've already accepted the fact. Now you also have to get used to this.”

    Ever since then, I often see my friends getting worried about little things: their bus comes late; they get bad grades on a test. But I just enjoy life.

    I am lucky to realize that it is a waste of energy to focus on what you have lost, and that the key to happiness is to take pleasure in what you have. Sounds simple, doesn't it? So why are many people unhappy?

    People often think happiness is based on what they achieve. “My whole life would improve if I had a new car.” But when you get the car and what happens? For a whole week you are walking on air. Then you go right back to being unhappy.

    Happiness is not a happening; it's a state of mind. Even though you have the whole world and you'll still be unsatisfied. And you have relatively(相对地) little but feel full of joy. Happiness comes from mastering the art of enjoying and taking pleasure in what you already have.