CIE A Level Biology复习笔记9.1.1 The Human Gas Exchange System

Remember to pay attention to command words in exams, as they will be asking different things. For example, a question asking you to “Describe” the structure of the alveoli is different from a question asking you to “Explain” the structure of the alveoli.“Describe” questions are asking you to give an account of something or to write events or processes in a logical order.“Explain” questions are asking you to write why something happens or to link its structure to its function – as a result of this, “because” will be an important part of your answer.