The shop owner suddenly stopped talking with his mouth ________ like a big “O”. It was the President Xi Jinping.
A:widely open
B:wide open
C:wide opened
D:widely opened
在美国历史上被誉为“开国元勋”和“黑奴解放者”的两位总统是( )
已知函数y=(k+2)xk2+k-4是关于x的二次函数,则k=____ .