第3题: [单项选择]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 参考答案:A