H₂S溶液中，在采取措施使pH增大的同时，则c(S^2－)的变化情况是

A．增大　　　

B．减小

C．不变

D．可能增大，也可能减小

Multipurpose Internet Mail Extension (MIME) is a (71) document messaging standard in theInternet enviroment.With MIME，users can send (72) Email messages that include audio，video，graphices，and text to any other user of TC/IP network.Richtext information can also be (73) into messages.It defines the fonts，formats，and (74) features of a document sothe document can be easily (75) on many different types of systems.

A．restored

B．redisplayed

C．stored

D．executed