柔石的小说《为奴隶的母亲》描写的是农村的什么习俗？
参考答案：
描写的是典妻典婚的习俗。
It was _____ back home after the experiment. [ ]
A. not until midnight did he go
B. until midnight that he didn't go
C. not until midnight that he went
D. until midnight when he didn't go
不属于慢性左心衰竭的体征的是（）。
A.左室舒张末期压力增高
B.心脏扩大
C.心尖部舒张期杂音
D.交替脉
E.双肺底湿性啰音
