冲脉的作用是
A．调节全身阳经经气B．涵蓄十二经气血C．调节六阴经经气D．约束纵行躯干的诸条经脉E．调节肢体运动，司眼睑开合
参考答案：B
— My brother fell off his bike and hurt his legs. — .
A．That’s too bad
B．He is too careless
C．He should be careful
D．I am sorry to hear that
能通过黏膜的是
A．IgA B．IgD C．IgE D．IgG E．IgM
