确诊流行性乙型脑炎常检查的抗体是（）。
A.特异性IgM抗体
B.血凝抑剩抗体
C.血凝素抗体
D.中和抗体
E.补体结合抗体
参考答案：A
Laura _____ in this school since she came to China. [ ]
A. is studying
B. was studying
C. will study
D. has studied
债权人的撤销权白债权人知道或应当知道撤销事由之日起( )年内行使。
A．1 B．2 C．3 D．5
