The presentation layer is concerned with the (1) and semantics of the information exchanged between two systems. The processes in two systems are usually exchanging information in the form of character(2), numbers, and so on. The information should be changed to bit (3) before being transmitted. Because different computers use different encoding systems, the presentation layer is responsible for(4) between these different encoding methods. The presentation layer at the sender changes the information from its sender-dependent format into a common format. The presentation layer at the receiving machine changes the common format into its(5)-dependent format.

空白（4）处应选择（）

A.capability

B.interoperability

C.reliability

D.dependability

“大清大皇帝允于即日降谕各省督抚大吏，以凡有华民情甘出口……无论单身或愿携带家属一并赴通商各口，下英国船只，毫无禁阻。”签署该文件的中国皇帝是（）

A.乾隆帝

B.道光帝

C.咸丰帝

D.光绪帝