题目

下列四个函数中,最小正周期是π且图象关于x=对称的是(    )A.y=sin(+)                          B.y=sin(2x+)C.y=sin(2x-)                            D.y=sin(2x-) 答案：解析:对于A,T==4π,舍去.对于B,T==π,令2x+=kπ+,∴2x=kπ+.∴x=+(k∈Z),舍去.对于C,T==π,令2x-=kπ+,∴2x=kπ+.∴x=+(k∈Z),不合题意,舍去.对于D,T==π,令2x-=kπ+,∴2x=kπ+.∴x=+(k∈Z).令k=0,得x=.∴选D.答案:DAttractions in WisconsinWisconsin Historical Museum30 N.Carroll Street on Madison’s Capitol SquareDiscover Wisconsin’s history and culture(文化)on four floors of exhibits.Open for public programs.Admission is free.Open Tuesday through Saturday,9∶00 am—4∶00 pm.(608)264-6555 www.wisconsinhistory.org/museumSwiss Historical Village612 Seventh Ave.,New GlarusThe Swiss Historical Village offers a delightful look at pioneer life in Ameri-ca’s heartland.14 buildings in the village give a full picture of everyday life in the nine-teenth-century Midwest.Tue.—Fri.,May 1st—October 31st,10∶00 am—4∶00 pm.Admission is $20.(608)527-2317 www.swisshistoricalvillage.comArtisan Gallery & Creamery Café6858 Paoli Rd.,Paoli,WIOne of the largest collections of fine arts and crafts(手工艺品) in Wisconsin.Over 5000 sq.ft. of exhibition space in a historic creamery.While visiting enjoy a wonderfully prepared lunch at our café overlooking the Sugar River.Just minutes from Madison!Gallery open Tue.—Sun.,10∶00 am—5∶00 pm.Café open Wed.—Sat.,11∶00 am—3∶00 pm.Sun.brunch with wine,10∶00 am—3∶00 pm.(608)845-6600 www.artisangal.comChristopher Columbus Museum239 Whitney St.,ColumbusWorld-class exhibit—2 000 quality souvenirs(纪念品) marking Chicago’s 1893 World Columbian Exhibition.Tour buses are always welcome.Open daily,8∶15 am—4∶00 pm.(920)623-1992 www.columbusantiquemall.com1.Which of the following is on Capitol Square?A.Wisconsin Historical MuseumB.Swiss Historical VillageC.Artisan Gallery & Creamery CaféD.Christopher Columbus Museum2.Where can you go for a visit on Monday?A.Wisconsin Historical MuseumB.Swiss Historical VillageC.Artisan Gallery & Creamery CaféD.Christopher Columbus Museum3.Where can visitors have lunch?A.At Wisconsin Historical MuseumB.At Swiss Historical VillageC.At Artisan Gallery & Creamery CaféD.At Christopher Columbus Museum