中国古代官吏铨选的途径很多，有世袭、军功、荐举、郎选、恩荫和科举制度。盛行于秦汉至魏晋南北朝时期的主要是                                                 （   ）

A．世卿世禄制（世袭制）

B．荐举贤才，授以官职

C．世家大族， 门第取士

D．分科举士，考试选官

Nearly 200 people entered the area ______ to mine diamonds in 2000, and eventually had to be driven off by the police.

A．irregularly

B．illegally

C．imperfectly

D．unusually