2019年考研英语一完形填空原文如下：
The human body is a highly complex system of interrelated parts that work together to keep you alive. Your heart, lungs, and brain are all part of this system. They work together to deliver oxygen to your body's cells and to remove waste products. Without them, you would not survive.
Your digestive system breaks down food into nutrients that your body can use. Your circulatory system carries these nutrients to all parts of your body. Your immune system protects you from disease. Your skeletal system supports your body and protects your organs. Your muscular system allows you to move.
All of these systems work together to keep you healthy. But sometimes, they don't work as well as they should. When this happens, you may become sick. If you don't take care of yourself, you may become seriously ill.
One of the best ways to keep your body healthy is to eat a balanced diet. This means eating a variety of foods that provide all the nutrients your body needs. It also means avoiding foods that are high in fat, sugar, and salt.
Another important way to keep your body healthy is to exercise regularly. Exercise helps to keep your heart, lungs, and muscles strong. It also helps to keep your weight at a healthy level.
Sleep is also important for your health. Your body needs sleep to rest and to repair itself. If you don't get enough sleep, you may become tired, irritable, and less able to concentrate.
Stress can also affect your health. High levels of stress can lead to a variety of health problems, including heart disease, high blood pressure, and diabetes.
There are many things you can do to keep your body healthy. Eating a balanced diet, exercising regularly, getting enough sleep, and managing stress are all important. By taking care of yourself, you can help ensure that you live a long, healthy life.
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