2016年考研英语二完形填空原文如下：
The human body is subject to many forces. One of the most important forces that affect us is the force of gravity, which keeps us on the ground. If this force were to be removed, we would float off into space. The human body also needs gravity to keep it in shape. Without gravity, our bodies would become elongated, like those of the stars.
Gravity also helps to protect us from the harmful rays of the sun. The sun gives off energy in the form of light and heat. This energy is carried to us by radiation. We would receive all of this radiation without gravity to stop it. It would kill us.
Another important force that affects us is friction. Friction is the force that makes it possible for us to walk, write, and do most of the things that we do. Friction also helps to keep us warm. When we walk, our feet rub against the ground. This friction produces heat that keeps us warm.
Friction can also be harmful. If you slide down a hill on your sled, the friction between the sled and the snow will cause you to slow down. If the friction is too great, you might stop before reaching the bottom of the hill.
The human body is also subject to the force of pressure. Pressure is the force that is applied to an object. For example, if you push against a wall, you apply pressure to it. The wall applies an equal and opposite force to you. This is called Newton's third law of motion.
The force of pressure is important because it helps to keep our bones strong. When we walk, our bones are subject to pressure. This pressure helps to keep our bones strong and healthy.
In conclusion, the human body is subject to many forces. These forces are necessary for our survival. However, some of these forces can be harmful. It is important to understand how these forces work so that we can protect ourselves from their harmful effects.
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