拆除代管房屋、产权不明确的房屋、已设定抵押权的房屋，依法均须办理公证手续。 ( )
参考答案：错
They knew nothing about ______ he was a thief.
A．that
B．which
C．what
D．the fact that
外源性支气管哮喘，浆细胞产生使人体致敏的抗体是（）
A.IgA
B.IgG
C.IgM
D.IgE
E.IgD
