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若vehicle=[['train','car'],['bus','subway'],['ship','bicycle'],['car']],则len(vehicle[1][0])结果是什么?
A.3
B.7
C.6
D.4
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若vehicle=['train','car','bus','subway','ship','bicycle','car'],则vehicle.count('car')结果是什么?
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A.2B.7C.6D.4
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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
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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
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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}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();}}
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阅读以下说明和C++代码，填充代码中的空缺，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红灯时也可通行，其余车辆按正常规则通行。
下面的C++代码实现以上设计，请完善其中的空缺。
[C++代码]#include＜typeinfo＞#include＜iostream＞using namespace std;class Vehicle {/*抽象基类,车辆*/public:virtual void run()=0;};class Emergency { /*抽象基类,可在红灯时通行的接口,函数均为纯虚函数*/public:______=0; //isEmergent()函数接口______=0; //runRedLight()函数接口};clasS Car:public Vehicle{public:～Car(){}void run(){/*代码略*/ ));class Truck:public Vehicle{public:～Truck(){}void run(){ /*代码略*/ });class PoliceCar:______ {private:bool isEmergency;public:PoliceCar():Car(),Emergency() { this-＞isEmergency=false;}PoliceCar(bool b):Car(),Emergency() {this-＞isEmergency=b;}～P0liceCar(){ }bool isEmergent(){ return ______}void runRedLight() { /*代码略*/ });/*类Ambulance、FireEngine实现代码略*/class TraficControlsystem { /*交通控制类*/private:Vehicle*v[24]; int numVehicles;/*在构造函数中设置初始值为0*/public:void control(){ //控制在紧急情况下应急车辆红灯通行,其他情况按常规通行for(int i=0;i＜numVehicles; i++){Emergency *ev=dynamic_cast＜Emergency*＞(v[i]);if(ev !=0) ______-＞runRedLight();else ______-＞run();}}void add(Vehicle*vehicle) { v[numVehicles++] =vehicle; }/*添加车辆*/void shutDown() {for(int i=0; i＜numVehicles; i++) { delete v[i];} }};int main(){TraficControlSystem*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 FireEngine());tcs-＞add(new Truck());tcs-＞contr01();tcs-＞ShutDown();delete tcs;}
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The school has made it a rule that no student shall take an illegal vehicle __________a school bus.A.other than
B.rather than
C.or rather
D.or else
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（）is the volume for loading goods of the vehicle.A、Vehicle tonnageB、Vehicle sizeC、Vehicle capacityD、Available Vehicle capacity
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单选题How did the narrator and his aunt travel to see his father?A
By car.B
By bus.C
By ship.D
By train.
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单选题What is suggested about Ms. Forsyth?A
She is knowledgeable about cars.B
Her employer will pay for her vehicle.C
She is planning to buy her first vehicleD
Her current car is unreliable.
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单选题11. abstract class Vehicle { public int speed（） { return 0； } } 12. class Car extends Vehicle { public int speed（） { return 60； } } 13. class RaceCar extends Car { public int speed（） { return 150； }} ...... 21. RaceCar racer = new RaceCar（）； 22. Car car = new RaceCar（）； 23. Vehicle vehicle = new RaceCar（）； 24. System.out.println（racer.speed（） + “， „ + car.speed（） 25. + “， “+ vehicle.speed（））； What is the result？（）A
0， 0，0B
150， 60， 0C
Compilation fails.D
150， 150， 150E
An exception is thrown at runtime.
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