[音频]
A Having a happy family.
B Planning a reunion party.
C Looking for exciting jobs.
D Meeting former classmates.
[音频]
A He totally understands the woman'ssituation.
B He fels very sorry for the woman'sroommate.
C Thewoman shouldn't keep pets in herdormitory.
D The woman shouldn't quarrel with herroommate.
维护阶段是软件生存周期中时间最长的阶段,也是花费精力和费用____的阶段。