Much of the criticism has focused on the railway’s online purchasing system，which has been

unable to _________ the huge demand．

A．take notice of

B．attach importance to

C．show preference for

D．keep pace with

同一场地上甲乙两座建筑物的结构自震周期分别为T_甲＝0.25s，T_乙＝0.60s，已知建筑场地类别为II类，设计地震分组为第一组，若两座建筑的阻尼比都取0.05，试求在抗震验算时甲、乙两座建筑的地震影响系数之比（α_甲/α_乙）。