______ the airport, he was arrested（逮捕） by the police.

A．As soon as arriving

B．Upon he arrived

C．On arriving

D．Upon arriving at

多发性硬化多位于（）

A.尾状核头

B.脑皮髓质交界区

C.第四脑室

D.蛛网膜下隙

E.基底节区