问题 选择题
如图所示,有一带电粒子(不计重力)紧贴A板沿水平方向射入匀强电场,当偏转电压为U1时,带电粒子沿轨迹①从两板中间飞出;当偏转电压为U2时,带电粒子沿轨迹②落到B板正中间;设带电粒子两次射入电场的水平速度相同,则电压U1、U2之比为(   )

A.1:1

B.1:2

C.1:4

D.1:8

答案

答案:D

单项选择题
完形填空
Mr. Hart, a London taxi driver, has a new black taxi. He hurries through the busy   36  every day.
One day when he was having a short rest, a young man jumped into his  37  .
“To the station as 38 as you can,” shouted the man in a very  39  way. “My 40  leaves at three o’clock.”
Mr. Hart did his best, but there was a lot of traffic. At every corner there was a  41  light.
The young man said,” Hurry up, man! I don’t want to  42  my train.”
“And I don’t want to have an  43  ,” replied Mr. Hart quickly.
While he was  44 , Mr. Hart suddenly recognized the man’s  45 . He was a 46 . The police were looking for him. His picture was in the  47  that he read.
Mr. Hart raced through the streets and  48  through red lights. Soon there was a police car  49  him. Mr. Hart raced on until he  50  the station. He stopped in front of the station at two minutes  51  three. The young man quickly jumped out of the taxi, and ran into the station.
 52 !” cried Mr. Hart. At the moment the police car stopped, too. “Quick! He is the thief!” shouted Mr. Hart. Two policeman  53  into the station. Three minutes later they  54  with the young man.
“well  55 !” a policeman said to Mr. Hart as they were taking the thief to the police car.
小题1:
A.stationsB.streetsC.buildingD.shops
小题2:
A.houseB.truckC.bedD.taxi
小题3:
A.fastB.slowlyC.quietlyD.early
小题4:
A.kindB.friendlyC.unfriendlyD.lovely
小题5:
A.trainB.busC.planD.ship
小题6:
A.greenB.yellowC.redD.black
小题7:
A.catchB.getC.leaveD.miss
小题8:
A.interestB.accidentC.answerD.example
小题9:
A.drivingB.listeningC.beggingD.walking
小题10:
A.faceB.eyeC.coatD.back
小题11:
A.driverB.runnerC.thiefD.worker
小题12:
A.filmsB.newspapersC.stationsD.offices
小题13:
A.walkedB.droveC.flewD.ran
小题14:
A.beforeB.besideC.behindD.near
小题15:
A.reachedB.passedC.hitD.entered
小题16:
A.afterB.toC.pastD.at
小题17:
A.LookB.StandC.StopD.Hands up
小题18:
A.brokeB.wentC.walkedD.rushed
小题19:
A.disappearedB.leftC.metD.returned
小题20:
A.finishedB.doneC.knownD.take