The old house of this area had to be ______ immediately so that the government could carry its flower-style-city programmer out.

A．torn up

B．torn down

C．torn away

D．torn out

在课堂中教师在用来演示难以看到的各种现象\运动过程和规律的课件属于（）型课件。

A.自主学习

B.训练复习

C.网络学习

D.课堂演示