What are joints ?the following questions:2. What are the functions of blood3. What are the organs of the diges4. Why do accidents happen?5. What is first-aid?6. Why do we need a house?7. What do we do in the study ro

What are joints ?the following questions:2. What are the functions o

1.	What are joints ?the following questions:2. What are the functions of blood3. What are the organs of the diges4. Why do accidents happen?5. What is first-aid?6. Why do we need a house?7. What do we do in the study ro
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