1,3,7,15,31,63,()。
A.127
B.144
C.102
D.104
参考答案:A
Please _____ any change of your address as soon as possible [ ]
A. inform us
B. inform us of
C. inform of us
D. inform to us
参与Ⅰ型超敏反应的最重要的Ig是()
A.IgG
B.IgM
C.SIgA
D.IgE
E.IgD