科举制度是逐渐完善于[ ]
A．隋朝
B．唐朝
C．宋朝
D．元朝
答案：B
_______ is no wonder the building is ________.
A. It ; in ruin B. That; in ruins C. This; in ruin D It; in ruins
新生儿室内湿度应保持在（）
A.45%～55%
B.55%～65%
C.65%～70%
D.50%～60%
E.60%～70%
