贝多芬创作的唯一的歌剧作品为()。
A.《科里奥朗》
B.《埃格蒙特》
C.《费德里奥》
D.《莱奥诺拉》
E.《格诺菲瓦》
F.《雅典的废墟》
参考答案:C
已知集合A={x|x2-3x+2=0},B={x|x2-mx+m-1=0},若B⊆A,求实数m的取值范围.
-When did you last see your first teacher?
-On ______Thursday last July, at ______celebration of her 30th year of teaching. [ ]
A. a; the
B. a; a
C. \; the
D. \; a