题目

函数y=sinx的图象按向量a=(-,2)平移后与函数g(x)的图象重合,则函数g(x)的表达式是A.cosx+2              B.-cosx-2             C.cosx-2             D.-cosx+2 答案：A解:y=sinx按a=(-,2)平移后,为y=sin(x+)+2=cosx+2.∴选A.When I came to my new school three years ago, I was surprised at how lonely I felt. Then one of my classmates invited me to her house for a dinner 1. I was a little anxious, but finally I gladly 2. Not really knowing how 3the bus ride should be, I 4when I saw the landmarks5 on my friend’s hand-drawn map. But when I got close enough to the 6, I found none of the streets were shown on the map. I was 7on a busy road with cars driving past without a person in sight. I had no 8when the next bus would come, 9when a bus did come by, I 10got on. I told the bus driver where I wanted to go and he said that I had caught the 11bus, but he let me stay on. After he had finished his scheduled bus route, he 12to help me out. I gratefully showed him my little hand-drawn map but 13did not help much. He finally 14me off at a main road to catch a different bus and was 15that he could not help me more. After a few minutes of walking, I noticed a bus pull up beside me. It was the16 bus driver. He explained that he didn’t want to leave me there 17. He sent out a call and someone radioed back, saying that the bus I needed to catch was about ten minutes away. At last I made it to the dinner party 18I was over an hour late. I am forever thankful for the 19that this bus driver had for me. His act of kindness left a20 on my heart.1.A.mealB.partyC.meetingD.time2.A.acceptedB.refusedC.gotD.received3.A.farB.difficultC.longD.bad4.A.drove onB.walked awayC.hurried byD.got off5.A.showB.showingC.shownD.to show6.A.street signsB.tall buildingsC.traffic lightsD.back yards7.A.queuingB.sittingC.standingD.waiting8.A.meaningB.ideaC.problemD.way9.A.soB.yetC.butD.still10.A.suddenlyB.luckilyC.finallyD.quickly11.A.rightB.wrongC.bestD.fastest12.A.suppliedB.refusedC.offeredD.wanted13.A.itB.heC.sheD.they14.A.keptB.droppedC.droveD.turned15.A.eagerB.worriedC.sorryD.disappointed16.A.sameB.nextC.kindD.silly17.A.helplessB.lonelyC.unaccompaniedD.alone18.A.afterB.althoughC.untilD.when19.A.respectB.concernC.helpD.love20.A.markB.signC.symbolD.line