下列是二元一次方程的是 [ ]
A．3x﹣2y
B．2x+1=3
C．4x2﹣2y=2
D．x+7y=0
答案：D
---Is your father in now？
--- No,he____ to Fan Changjiang Memorial with his friends.
A．has been
B．has gone
C．will go
D．went
下列抗体中是Graves病的直接致病原因的是（）
A.TSAb
B.TSBAb
C.TGI
D.TPOAb
E.TgAb
