问题
单项选择题
The blood-gas barrier in alveoli may include each of the following EXCEPT
A．cytoplasm of a type Ⅱpneumocyte
B．basal lamina of type Ⅰalveolar cells
C．cytoplasm of a type Ⅰpneumocyte
D．endothelium of a continuous capillary
E．basal lamina of an endothelial cell
答案
参考答案：A