单项选择题
At the beginning of the 20th century, when composers, singers, and _______ worked together to create hit songs, pop music came into being.
A、publishers
B、stations
C、government
D、writers
At the beginning of the 20th century, when composers, singers, and _______ worked together to create hit songs, pop music came into being.
A、publishers
B、stations
C、government
D、writers
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单项选择题
If a person had a mutation in the gene encoding J (joining) chains, which of the following classes of antibodies could NOT be produced? ()
If a person had a mutation in the gene encoding J (joining) chains, which of the following classes of antibodies could NOT be produced? ()
A．IgA
and IgM
B．IgA
and IgG
C．IgG
and IgE
D．IgD
and IgE
E．IgG
and IgM