题目

阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。At Dana’s yard sale, Tim chose a baseball from the toys spread on the card table and asked about the price. Dana told him everything was a quarter except Nezumi, a cotton toy rat. It was grey with some cotton sticking out from the hole where an ear had been torn off.“Nezumi is extra special, so he is ten dollars. He needs a safe new home.” Dana sighed. Tim laughed saying he didn’t have ten dollars. Dana laughed too and gave Nezumi to Tim as a free gift because he was her friend. When Tim whispered肺容积及气压发生变化时我们才能完成肺与外界的气体交换．当肺吸气时，肺容积及气压的变化是（　　）A．肺容积缩小，肺内气压升高?B．肺容积增大，肺内气压升高?C．肺容积增大，肺内气压下降?D．肺容积缩小，肺内气压下降