按照群体内成员相互作用的目的和性质，可以把群体分为（）。
A.正式群体
B.松散群体
C.非正式群体
D.联合群体
参考答案：A, C
—Who did it better, Bill or Henry?
—I think Bill did just _______ Henry.[ ]
A. as well as
B. as good as
C. as better as
D. more badly than
骨纤维异常增生症常见的典型X线表现是
A．不规则骨质破坏
B．大小不等的圆形齿状阴影
C．呈日光放射状排列的骨刺
D．单囊状阴影
E．磨玻璃样阴影
