脑外伤中，脑组织受破坏较轻，软脑膜尚完整的是（）
A.脑震荡
B.脑挫伤
C.脑裂伤
D.颅内血肿
E.弥漫性轴索损伤
参考答案：B
— Must I stay here with you?
— No, you ______. You may go home, but you ______ go to the net bar. [ ]
A.mustn't, needn't
B.needn't, mustn't
C.must, need
D.need, must
1~14中，所有的质数的和与合数的和相差多少？
