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Write a letterto your pen pal, introducingyour family with a family photo.The following information should be included in the letter:My father is tall with curly brown hair.My mother is pretty with short black hair,My elder brother, John, is short with straight brown hair.My eldersister, Jane, isa beautiful girl with long straighthairJuly 28, 2020Dear Mary,How's everything going? In your last email, you wanted to know myfamily, so I give you my family photo.There are ()people in my family. My father is tall with( )while my motheris ()with (). My (), John, is(). My elder sister, Jane, is ().The girl with wavy hair is (). I’m ()the in my family. How aboutyour family?Ilook () to your early reply.Sincerely yours,Alice

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The most accurate description of the basic structure of Ig molecule is

A tetrapeptide chain consisting of 2 heavy chains and 2 light chains
B. A dipeptide chain consisting of 1 heavy chain and 1 light chain
C. A tetrapeptide chain consisting of 2 identical heavy chains and 2 identical light chains
D. A tripeptide chain consisting of 1 heavy chain and 1 light chain
E. A tetrapeptide chain consisting of 4 identical peptide chains

The Igs without hinge area are

A. IgA and IgD
B. IgM and IgE
C. IgA and IgM
D. IgG and IgE
E. IgA and IgE

The Ig with the strongest ability to activate complement is

A. SIgA
B. IgM
C. IgG
D. IgD
E. IgE

The Igs that exist in the form of monomer are

A. IgA、IgD、IgM
B. IgM、IgE、IgD
C. IgA、IgM、IgG
D. IgE、IgG、IgD
E. IgA、IgE、IgM

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