影响滑坡形成的主要因素有（）
A.岩石类型
B.斜坡几何形态
C.水的活动和人为因素
D.斜坡上部荷载
参考答案：A, B, C, D
方程4x+2x﹣12=0的解x=（ ）．
It is the test system, _____ the teachers, that is to blame for the heavy burden of middle school students nowadays.
A．other than
B．or rather
C．rather than
D．more than
