Session对象的默认有效期为多少分钟：()
C
暂无解析
________(catch)intherain,hewaswettotheskin.
Iknowitisn’timportantbutIcan’thelp________aboutit.
Heaskedmewhethermybrother________(fly)toBeijing.
Theassociationis________toraisingfundstohelptheblind.
设数列收敛，则（）