（1）How structures and classes in C++ differ?
A：Structure members are public by default whereas, class members are private by default. Both of them can have private and public members.
（2）Which of the following shows multiple inheritances?
A：In multiple inheritance, a single class is inherited from two classes. So in A,B->C, Class C is inherited from A and B, whereas in A->B->C, C from B and B from A called simple inheritance, in A->B; A->C, B and C are inherited from A which is called hierarchical inheritance.
（3）C++ is
A：C++ supports both procedural(step by step instruction) and object oriented programming(using concept of classes and objects).
（4）What does modularity mean?
A：Modularity means dividing a program into independent sub programs so that it can be invoked from other parts of the same program or any other program.
总结：真的没有想到自己的基础会这么不扎实，还是要多多刷题才行呀~
题目出处：https://www.sanfoundry.com/cplusplus-programming-questions-answers-oops-concept-1/