阅读理解 North American black bears are shy animals．They are fearful by nature，and will usually run away if they see or hear people．Because of this，it can be difficult for scientis
The medical term for a broken bone is a fracture．But there are different kinds of fractures．A single fracture is when a bone is broken in just one place．You may have heard the term hairline frac
完形填空 Charlie came from a poor village. His parents had __1__ money to send him to school when he was young. The boy was very sad. Mr. King lived next to him. He found the boy __2_ and had p
