下列何者是来源于原始间叶组织的肿瘤
A．骨巨细胞瘤
B．骨样骨瘤
C．骨软骨瘤
D．尤文肉瘤
E．软骨肉瘤
参考答案：D
_____ is to attend our evening party. [ ]
a. both the singer and the dancer
b. Either the singer or dancers
c. The singer or dancers
d. The singer and dancer
在文莱为人指东西用手的（）。
A、拇指
B、食指
C、中指
D、无名指
