下列哪支血管闭塞最易导致偏瘫？（）
A.小脑后下动脉
B.大脑中动脉
C.脊髓前动脉
D.小脑下前动脉
E.大脑前动脉
参考答案：B
____ the teacher expected, the students were very excited after hearing the good news.
A．As
B．So
C．What
D．/
一个等差数列的前12项的和为354，前12项中偶数项的和与奇数项的和之比为32:27，则公差d的值为( )．
A．3
B．4
C．5
D．6
