软骨组织发生的良性肿瘤为（）。
A.成骨细胞瘤
B.甲下骨瘤
C.皮质旁软骨瘤
D.成软骨细胞瘤
E.骨软骨瘤
参考答案：C, D, E
People __________ the west often celebrate Halloween __________ many ways.
A．on, with
B．in, with
C．in, in
D．in, on
