从唐朝中后期开始的经济重心的南移，到____最后完成。[ ]
A．唐末
B．北宋初期
C．北宋中后期
D．南宋
答案：D
肾实质性高血压属于容量依赖型者占()
A.50%
B.60%
C.70%
D.80%
E.100%
34. —He failed his exam again.
—But what did you _____? Had he ever been working hard?
A．think
B．expect
C．consider
D．imagine
