有关老年人下述哪项是错误的（）
A.肾血流量减少
B.发生氮质血症较多见
C.醛固酮减少
D.肌酐清除率降低
E.肾小球滤过率降低
参考答案：B
Children are excited about the approach of Christmas, _____ may bring great happiness to them.
A．it
B．which
C．what
D．that
伸缩缝在基础部位（）断开。
A、严禁
B、宜
C、必须
D、不必
