问答题
（填入物主代词，注意词尾变化）Thomas treibt gern Sport. __________ Lieblingssport ist Fußball.
（填入物主代词，注意词尾变化）Thomas treibt gern Sport. __________ Lieblingssport ist Fußball.
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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
的值是
