下列因素中,哪些会对团体的形成产生影响( )。
A.人际需要
B.成员的沟通
C.共同的目标
D.自我归类
参考答案:A,C,D
把多项式ax2-ax-2a分解因式,下列结果正确的是( )
A.a(x-2)(x+1)
B.a(x+2)(x-1)
C.a(x-1)2
D.(ax-2)(ax+1)
—Was it in April, 1970 that China ________ sending its first satellite into space?
—Yes, that's right.
A.succeeded in
B.managed to
C.attempted in
D.tried to