接～R活疫苗后，体内产生的抗体种类主要是（）
A.IgG、SIgA
B.IgD
C.IgE
D.IgG
E.IEM
参考答案：D
--What made her so upset?
-- __________
A．Lost her bike.
B．Losing her bike,
C．She lost her bike .
D．Because of losing her bike.
什么是BTS？
