Pandas live in the ____________ of China.[ ]
A. south
B. north
C. southwest
D. northwest
答案:C
已知x=1是一元二次方程x2-2mx+1=0的一个解,则m的值是( )
A.1
B.0
C.0或1
D.0或-1
鼻咽癌侵犯颅底,最常见的途径是()
A.圆孔
B.卵圆孔
C.破裂孔
D.咽缝
E.翼内肌