引起骨组织呈浸润性破坏的肿瘤是（）。
A.脊索瘤
B.脑膜瘤
C.表皮样囊肿
D.颅咽管瘤
E.蛛网膜囊肿
参考答案：A
You _______ to the meeting this afternoon if you have something important to do. [ ]
A. needn't to come
B. don't need come
C. don't need coming
D. needn't come
航空煤油
