题目

 -----The old man wouldn’t stay at home for a rest even if it rained.    ----      . He would feel sick if he stayed home for one day.   A. So would my grandpa                        B. So wouldn’t my grandpa   C. Neither would my grandpa                        D. Nor wouldn’t my grandpa 答案：C 肺是气体交换的场所，肺泡数目极多，展开面积大，肺泡壁薄且缠绕着许多弹性纤维和毛细血管。这表明器官是________相统一。