所谓社会科学数学化就是指数学向（）的渗透，运用数学方法来揭示（）的一般规律。
参考答案：社会科学；社会现象
二尖瓣狭窄并发心房纤颤易发生的并发症是
A．心力衰竭
B．栓塞
C．亚急性感染性心内膜炎
D．肺部感染
E．心肌梗死
-Why was professor Liu thundering in the classroom yesterday?
-A student's interrupting his speech ____ the burst of hisanger. [ ]
A. set up
B. set out
C. set about
D. set off
