—I can hardly make myself understood in Chinese. Would you please give me some help?

—________. We are trying to help you.

A．Take your time

B．Take it away

C．Take it easy

D．Take it over

局部粘膜抗感染免疫的最重要的Ig是

A．IgM
B．IgG
C．IgD
D．IgE
E．SIgA