a case of stupidity的用法和样例：
- It was a case of stupidity, not dishonesty.
- This is a case of stupidity, not dishonesty.
- This is a case of stupidity not dishonesty.
- It is a case of the student outstripping the teacher.
- The tough new measures on drug abuse is likely to be a case of killing or cure.
- The case adds up to a case of robbery.