能早期发现脑梗死的最佳辅助检查为（）
A.脑脊液
B.血常规
C.MRI
D.脑电图
E.脑血流图
参考答案：C
我国四大直辖市中，靠近首都的是______，位于长江中下游的是______．
If you are traveling _____ the customs are really foreign to your own, please do as the Romans do ?[ ]
A. in which
B. what
C. when
D. where
