当分母x-1≠0，即x≠1时，分式xx-1有意义；
故选A．
—She doesn't speak _____ her friends.
—I agree with you. But her written work is wonderful. [ ]
A. as often as
B. as well as
C. as good as
D. as many as
美国于1978年确立了一部规范政府官员的（）。
A．《荣誉法典》
B．《不当赠品及不当表示防止法》
C．《从政职业法》
D．《谢尔曼法》
