A.{x|≤x＜                            B.{x|x＜

C.{x|x＜1                                    D.{x|x＜}

A.｛x|4≤x＜5                               B.｛x|x≥4,或x≤5｝

C.｛x|2＜x≤3,或4≤x＜5               D.｛x|x≤3,或x＞2｝

A.｛x|-1＜x＜3｝                           B.｛x|x＞3,或x＜-1｝

C.｛x|-3＜x＜1｝                           D.｛x|x＞1,或x＜-3｝