具有男性化作用的卵巢肿瘤为：
A．两性母细胞瘤
B．无性细胞瘤
C．睾丸母细胞瘤
D．胚胎癌
E．类癌
参考答案：C
----Which subject do you like better, math or physics?
---- I prefer _______ math ________ physics.
A．to learn , to learn
B．learning , to learning
C．learn , than learn
D．to learn , than learn
“变奏曲”是音乐术语，这首诗为什么题为“星星变奏曲”？
___________________________________________________
