秦汉以来我国中央和地方关系演变的趋势是：

①削弱地方，加强中央 ②分散地方官吏权力，防止割据

③强化对地方官吏的控制 ④对边疆地区的治理渐趋严密 [ ]

A、①②③④

B、②③④

C、①③④

D、①②③

Many Internet users make _____ most of the half-price promotion and it is _____ good opportunity for online shopkeepers to get their names known.

A．a; the

B．/; the

C．the; /

D．the; a