Recently I am busy writing a guide and the guide describes ______. [ ]

A. how I think wilt life on Mars be like

B. what I think will life on Mars be like

C. how I think life on Mars will look like

D. what I think life on Mars will be like

早期Ab的Ig（）

A.IgA

B.IgM

C.IgD

D.IgE

E.IgG