题目

听下面一段较长对话，回答以下小题。【1】What does the woman think of her classes?A.Average. B.Small. C.Large.【2】What is the probable relationship between the speakers?A.Schoolmates. B.Family members. C.Neighbors.【3】What can we know about the man?A.He is often late for class.B.He has got used to his classes.C.He must run between his morning classes. 答案：【答案】【1】C【2】A【3】C【解析】【原文】此题为听力题，解析略。If someone has an accident and can no longer walk, scientists might be able to use stem cells to ___ the damaged cells and allow that person to walk again.A．rescueB．removeC．reserveD．replace