A.1
B.2
C.3
D.4
若vehicle=[['train','car'],['bus','subway'],['ship','bicycle'],['car']],则len(vehicle[1])结果是什么?A.2B.7C.6D.4
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22．．What kind of car does Mrs Hill have?A． A fast and new car．B． A fast but old car．C． A slow and old car．D． A fast but small car．
29． When people travel on business(出差) ,they usually take _________ ．A． a train or a planeB． a boat or a trainC．a car or a boat ．D．a plane or a car
In order to cut down on the carbon emission，more people choose to travel______.A．by electric car，bicycle or planeB．by private car，bicycle or busC．by bus，electric car or planeD．by bicycle. bus or electric car
阅读以下说明和Java代码，填充程序中的空缺，将解答填入答题纸的对应栏内。 [说明] 某应急交通控制系统(TraficControlSystem)在红灯时控制各类车辆(Vehicle)的通行，其类图如下图所示，在紧急状态下应急车辆在红灯时可通行，其余车辆按正常规则通行。下面的Java代码实现以上设计，请完善其中的空缺。[Java代码]abstract class Vehicle{public Vehicle(){ }abstract void run();};interface Emergency{ ______; ______;};class Car extends Vehicle{public Car(){ }void run(){ /*代码略*/ }};Class Truck extends Vehicle{public Truck(){ }void run() { /*代码略*/ }};class PoliceCar ______ {boolean isEmergency= false;public PoliceCar(){ }public PoliceCar(boolean b) {this.isEmergency=b; }public boolean isEmergent(){ return ______ }public void runRedLight(){ /*代码略*/ }};/*类Ambulance、FireEngine实现代码略*/public class TraficControlsystem { /*交通控制类*/private Vehicle[]V=new Vehicle[24];int numVehicles;public void control(){for {int i=0; i＜numVehicles; i++){if(V[i]instanceof Emergency&&((Emergency)v[i]).isEmergent()){(______).runRedLight();}else______. run();}}void add(Vehicle vehicle){ v[numVehicles++]=vehicle;}/*添加车辆*/void shutDown(){/*代码略*/}public static void main(String[]args){TraficC0ntrolSystem tcs=new TraficControlSystem();tcs.add(new Car());tcs.add(new PoliceCar());tcs.add(new Ambulance());tcs.add(new Ambulance(true));tcs.add(new FireEngine(true));tcs.add(new Truck());tcs.add(new FireEngine());tcs.control();tcs.shutDown();}}
Travelling by train to Tokyo takes approximately one hour less _____ travelling by car. A. for B. with C. as D. than
The car crashed into the train,and the driver was killed__the spot.A.on B.at C.to D.by
