要使分式11-x有意义，
则1-x≠0，
解得x≠1．
故答案为≠1．
_____earth scientists understand how and why earthquakes happen, forecasts are usually inaccurate. [ ]
A. As
B. While
C. Because
D. If
三河马、三河牛生活的牧区是[ ]
A．新疆牧区
B．内蒙古牧区
C．青海牧区
D．西藏牧区
