It was ______ great shock to the world that two airplanes crashed into ______ World Trade Centre in New York on Sept. 11.

A．a; ／

B．the；the

C．a；the

D．/；the

膳食中限制蛋白质及钠盐饮食（）

A.肠梗阻

B.溃疡病

C.甲状腺功能亢进症

D.高血压

E.急性肾衰竭