因式分解：
（1）x2-4(x-1) （2）4(m+n)2-9(m-n)2
（1）(x-2)2 ；（2）(5m-n)(5n-m)
We know ______ about the new teacher except that she just came back from the US. We hope to know her better.
A．everything
B．nothing
C．something
D．anything
如果说粗心大意是稳定的个性特征，漫不经心则是暂时的心理状态。（）
