Your body is special﹣no two people in the world are alike，Although you are different from everyone else，you have exactly the same body parts as the people around you，doing different jobs that keep all of us alive．

What is inside my head？

Your head houses the most valuable part of your body﹣your brain．As you are reading，your eyes send pictures to your brain which makes meaning from what you see．Your brain helps you to remember and think，and makes sure your body is doing what it should．

What is my skin（皮肤） for？

Your skin covers your body．In most parts of your body，the skin is just as thick as half a centimeter．If you have your skin cut，it will have a quick cure and stop viruses from getting into your body．Your skin also helps you feel the heat and coldness of the environment around you．Hair grows from inside the skin．When you feel hot，extra heat comes out through your skin．As a result，your body temperature drops．

How do I move？

Muscles（肌肉） are found in most parts of your body．They work with your bones to help you move﹣whenever you cry or smile，eat or speak，walk or dance，etc．

Why do I breathe？

Your body needs to take in oxygen from the air and give out the unwanted carbon dioxide in the body．When you breathe，air comes through your nose and mouth into your lungs（肺） where oxygen flows to different parts of your body．

What makes me sneeze？

When dust or a strong smell gets into your nose，you sneeze．This is the way your body cleans up the dust in your nose．Your lungs push out the air and try to clear your nose．

What does my heart do？

Your heart is a very special muscle．It is slightly bigger than your fist （拳头） and grows bigger as you do．If you place your hand on your heart，you will feel your heart beating which forces blood to move around your body．

（1）The underlined word "houses" in the passage probably means　　．

A．stores

B．locks

C．creates

D．builds

（2）If you have no skin covering your body，what would happen？　　

A．Extra heat can only stay inside our body．

B．Viruses can't get into our body easily．

C．We can't feel the changes in temperature．

D．Our body can be guarded by our hair．

（3）What is the true fact about your body？　　

A．Our heart is the same size from birth．

B．We take in carbon dioxide to stay alive．

C．Our muscles stop working when we nod．

D．Sneezing is a way to clear our nose．

（4）Which is the best title for this passage？　　

A．What Your Body Needs

B．How Your Body Works

C．Why Your Body Grows

D．When Your Body Moves．