1. Which of the following keyword is used to specify private members? A) public B) private C) protected D) friend 2. Which of the following is the wrong prototype of overloading the subtraction operator? A) Volume operator-(double,double); B) double Volume::operator-(double); C) Volume Volume::operator-(volume); D) Volume operator-(Volume, Volume); 3. Which of the following is wrong? A) object is an instance of class B) each object belongs to only one class. c) a class can only have one object; D) the relation between class and object is much like that of data type and variable. 3. AC class is a class that has a virtual function. A) const B) public C) abstract D) friend 4. Which is the purpose of destructor? A) it is just a normal member function. B) initialize class C) initialize object D) free the occupied source 5. Given class A, how many times will the constructor be called when statement A array[3] is executed? A) 1 B) 2 C) 3 D) 4 6. Given class Myclass, which of following is to declare its copy constructor? A) Myclass&( Myclass x); B) Myclass(Myclass x); C) Myclass(Myclass & x); D) Myclass(Myclass *x)