____ is no doubt that Premier Wen Jiabao’s US visit helped develop China-Us economy.  [ ]

A. It                  

B. There              

C. This          

D. That

下列各项，不属于消渴并发症的是（）

A.雀目、夜盲

B.疮疖痈疽

C.肺胀

D.水肿

E.中风