∵x-1x+2有意义，
∴x-1≥0x+2≠0，
解得；x≥1．
故选D．
Why should we elect him _________mayor? I mean last year he was elected as _________ member of the Congress and he has failed to keep any promise he made during the election.
A．a; /
B．the; the
C．a; the
D．/; a
学校课余体育训练的固有特点是（）。
A.早期性
B.全面性
C.专业性
D.基础性
