Dirk Andrewi,Tony were named as assistant professors, Believe it nor not,        three of them were of        age．

A．／：all

B．／：the

C．the；all

D．the ;the

“限购令”引起了社会各界广泛争议，请根据给定资料1-5，指出争议的焦点是什么，并就双方的理由分别加以概述。
要求：指明“焦点”，概括全面，条理清楚，语言流畅。不超过300字。