—My parents always tell me _______ others late at night.

—They're right. It's not polite. [ ]

A. call

B. to call

C. not to call

瘤细胞多呈漩涡状排列的肿瘤是（）。

A.畸胎瘤

B.黑色素瘤

C.脂肪肉瘤

D.脑膜瘤

E.横纹肌肉瘤