下列关于系统软件的4条叙述中，正确的一条是（）
A
暂无解析
下列叙述中错误的是（）
防范病毒的有效手段，不正确的是（）
Shewasonceayoungcountrywifewithchickensinthebackyardandaviewof_______mountainsbehindtheappleorchard.
_____time,he’llmakeafirst-classtennisplayer.
Josephwasverylucky（）withhislife;healmostdidnotgetoutoftheroom.
Wecanconcludefromthepassagethat________.
Itisnecessarythatthestudents____moreexcercisestodo.
____isnoreasonfordischargingher.
_____ifIhadarrivedyesterdaywithoutlettingyouknowbeforehand.
Thecelebritysaysincourtpapersshe“hasno__________ofgivinganyauthorizationtoanyonetoproceedwithadivorce.”
Itisimperativethatstudents_____theirtermpapersontime.
Arrivingatthebusstop,_____waitingthere.