第一节短文改错(共10小题；每小题1分，满分10分)
People communicate in words. Do you think you can communicate without words? A smile on your face show you are happy but friendly. Tears in eyes tell the others that you are sad. When you put up your hand in class, the teacher knows you want say something. Other things should also carry messages. For example, a sign at the bus stop helps you to know which bus to carry. Signs on the door tell you if to go in or out. Have you ever seen that there are a lot of sign around you and that you receive messages from it all the time?