在南极考察期间，许多科考队员都会出现嘴唇干裂，其原因是[     ]

A．海拔高，空气稀薄

B．气候干燥，空气中水分少

C．气候严寒，没有降水

D．光照过于强烈

Contract closeout is a process that involves（）

A.Customer satisfaction analysis and final payment

B.Administrative closeout and archiving records

C.Finial contractor payment and Lessons learned

D.Product verification and administrative closeout