下列关于成熟畸胎瘤叙述，正确的是（）。
A.切面为多房
B.多含有牙齿
C.又称皮样囊肿
D.有时引起甲亢
E.其恶变多发生于儿童
参考答案：C
情景交际运用。
A: Tom, what's that on the table?
B: Oh, it's a __1__ of my family.
A: Can I have a look?
B: Yes!
A: Is the girl your sister?
B: No. She is my cousin. She's my uncle's __2__ .
A: Is the boy in green your __3__?
B: Yes. We are twins (双胞胎).
A: Is the man in red your father?
B: No, he __4__ He is my uncle.
A: Oh, __5__ is your mother?
B: She is in the middle (中间) of the photo.
下列说法正确的是（）
A.加速度增大，速度一定增大
B.有加速度的物体，其速度一定增加
C.物体的加速度不断减小，速度一定越来越小
D.速度很大的物体，加速度可能很小
