如果□×3ab＝3a²b，则□内应填的代数式是(        )

如图，在一条笔直的东西向海岸线l上有一长为1.5km的码头MN和灯塔C，灯塔C距码头的东端N有20km．一轮船以36km/h的速度航行，上午10：00在A处测得灯塔C位于轮船的北偏西30°方向，上午10：40在B处测得灯塔C位于轮船的北偏东60°方向，且与灯塔C相距12km．

往硫酸和硫酸铜的混合稀溶液中，加入一定量的铁粉，若充分反应后，过滤得滤液和剩余固体，则依此推论正确的是（    ）

古诗文阅读

（一）阅读下列文言文，回答1--5题

太平州学记

宋  张孝祥

学，古也。庙于学以祀孔子，后世之制也。阁于学以藏天子之书，古今之通义，臣子之恭也。当涂于江淮为名郡，有学也，无诵说之所；有庙也，无荐享之地；有天子之书，坎而置之屋壁。甲申秋，直秘阁王侯秬来领太守事，于是方有水灾，尽坏堤防，民不粒食。及冬，则有边事，当涂兵之冲，上下震揺。侯下车，救灾之政，备敌之略，皆有次叙。饥者饱，坏者筑。赤白囊，昼夜至，侯一以静填之。明年春，和议成，改元乾道，将释奠于学。侯语教授沈瀛曰：“学如是！今吾州内外之事略定，孰先于此者？”命其掾蒋晖、吕滨中撤而新之。先是郡将欲楼居材旣具侯命取以为阁辟其门而重之凡学之所宜有无一不备。

客有过而叹曰：“贤之不可已也如是夫!今之当涂，昔之当涂也，来为守者，孰不知学之宜葺，而独忘之者，岂真忘之哉？力不赡耳！始王侯之来，民尝以水为忧，已又以兵为忧。王侯易民之忧，纳之安乐之地，以其余力大新兹学，役不及民，颐指而办。贤之不可已也如是夫！”

客于是又有叹也：“尧、舜、禹、汤、文、武之天下，传之至今，天地之位，日月之明，江河之流，万世无敝者也。时治时乱，时强时弱，岂有他哉？人而已耳！财用之不给，甲兵之不强，人才之不多，宁真不可为耶？《诗》曰：‘无竞维人。’谓予不信，请视新学。”

夏四月既望，厉阳张某记 。

【注】①当涂，古县名，宋代称太平州，今属安徽。②王侯秬，王秬，时为太平州知州，古代对士大夫的尊称。③赤白囊，古代递送紧急情报的文书带袋。

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Tomato Festival

    Started in 2005, the Tomato Festival has grown into a local tradition in Malta． In recent years, the festival has added amusement park-style rides and a yearly Creature Feature, which screens old horrible movies．There are also dance competitions, parades and pancake breakfast．Third weekend in August．

    Address: 833 Tinkham Rd, Fountain Park, Wilbra-ham, Massachusetts 01095

    Phone: （413）599-0010

                                                                                                           Brat Days

    Don't mistake this festival for a day filled with poorly behaved children． Begun in 1953, the gathering is the biggest festival in the city each year and features more than 50 stands selling the sausage, as well as a contest to see who can quickly eat the most bratwurst in ten minutes．Early August．

    Address: 17th and New Jersey sts, Kiwanis Park, She boygan, Wisconsin 53081

    Phone: （920）457-9491

                                                                                               Hope Watermelon Festival

    The festival dates back to the 1920s, when many trains went through this small town and local watermelon growers would sell their watermelon to parched travelers．These days, the festival sees a Watermelon Queen crowned（加冠的） and sometimes a world-record watermelon grown．There are also more than 300 stands selling arts and crafts from a six-state area, as well as a car show and the Watermelon Olympics．Early August．

    Address: 108 W 3rd St, Hope, Arkansas 71801

    Phone: （870） 777-3640

                                                                                                     Oyster Festival （牡蛎节）

    Featuring appearances from tall ships and oyster boats, this festival has regularly drawn 60,000 visitors a year since it began in 1978．More than 3,000 volunteers make the festival possible each year．Norwalk is less than a two-hour drive from many of New England's larger cities, making it easy to attend the festival during a trip to New York or Hartford．Weekend after Labor Day．

    Address: Sea view Ave, Veteran's Park, East Nor-walk, Connecticut 06855

    Phone: （800） 866-7925